• Indiana University Archives, @iubarchives, https://twitter.com/IUBArchives 
• The Robbins Collection Center, University of California at Berkeley, @UCBRobbins, https://twitter.com/UCBRobbins 
• Trinity College, the University of Dublin, Research Collections, @ResearchColls, https://twitter.com/ResearchColls 
• University of Limerick, Special Collections and Archives Department, Glucksman Library, @UL_SpecColl, https://twitter.com/UL_SpecColl
• University College Cork, Special Collections, Archives & Repository Services, UCC Library, @theriversideUCC, https://twitter.com/theriversideUCC 
• University of Alabama, Division of Special Collections, @coolathoole,  https://twitter.com/coolathoole
• Special Collections/Manuscripts and Archives Department, University of Delaware, @UDSpecColl, https://twitter.com/UDSpecCol
• Special Collections & Archives, George Mason University, @gmusca, https://twitter.com/gmusca
• James Madison University Special Collections, @JMUSpeColl, https://twitter.com/JMUSpeColl
• W.D. Jordan Special Collections Library, Queen's University @jordan_library, https://twitter.com/jordan_library 
• William Andrews Clark Memorial Library (UCLA), @ClarkLibUCLA, https://twitter.com/ClarkLibUCLA
• UCLA Library Special Collections, @UCLALSC, https://twitter.com/UCLALSC
• Manuscripts and Archives Division, The New York Public Library, @NYPL_Archives, https://twitter.com/NYPL_Archives
• The Bancroft Library, UC Berkeley, @bancroftlibrary, https://twitter.com/bancroftlibrary
• Folger Shakespeare Library, Washington DC, @FolgerResearch, https://twitter.com/FolgerResearch 
• The Huntington Library, Art Collections, and Botanical Gardens, @TheHuntington, https://twitter.com/TheHuntington
• University of Iowa, Special Collections and University Archives, @UISpecColl, https://twitter.com/UISpecColl 
• Do It Yourself History Transcription Project, @DIY_History, https://twitter.com/DIY_History 
• Iowa Women's Archives, @IWArchives 
• University of Miami, Special Collections https://twitter.com/um_spec_coll  
• The Rare Book & Manuscript Library, University of Illinois at Urbana-Champaign, https://twitter.com/illinoisrbml 

• Lambeth Palace Library,https://twitter.com/lampallib

• Linda Hall Library of Science, Engineering & Technology: https://twitter.com/LindaHall_org  
• Newberry Library, Chicago, IL, @NewberryLibrary, https://twitter.com/NewberryLibrary  
• Newberry Library Digital Progam @DigitalNewberry, https://twitter.com/DigitalNewberry
• The Morgan Library, New York City, @MorganLibrary, https://twitter.com/MorganLibrary
• Wellcome Library, London, @WellcomeDigital, https://twitter.com/WellcomeDigital  
• Bodleian Libraries, University of Oxford, @Bodleianlibs, https://twitter.com/bodleianlibs  
• Harry Ransom Center, The University of Texas at Austin, @RansomCenter, https://twitter.com/ransomcenter  
• University of California San Diego, Mandeville Special Collections and Archives, @UCSDmscl, https://twitter.com/UCSDmscl 
• Daughters of Charity Province of St. Louise Archives, https://twitter.com/Archives_DC 

• Special Collections, University of Glasgow Library, https://twitter.com/GUspcoll

• Archive Services, University of Glasgow Library, https://twitter.com/GUArchives 

• Sheffield Centre for Early Modern Studies, University of Sheffield https://twitter.com/SheffieldCEMS

• University of Westminster, Polytechnic of Central London (PCL), Regent Street Polytechnic, and Royal Polytechnic Institution (RPI),https://twitter.com/UniWestArc

• Special Collections at Brunel University Library,https://twitter.com/BrunelSpecColl

• CILIP Library and Information History Group,https://twitter.com/CILIP_LIHG

• Slade School of Fine Art,https://twitter.com/SladeArchive

• PSU Library’s University Archives & Special Collections,https://twitter.com/PSULibArchives

• Slate Magazine's The Vault Blog,https://twitter.com/SlateVault

• Harry Ransom Center (UT Austin) https://twitter.com/RansomFragments

• SAS, University of London,https://twitter.com/InScribe_SAS

• Digital Production Services, Brown University Library.https://twitter.com/BrownCurio

• RUSI Library of Military History,https://twitter.com/RUSI_Library

• The Royal Astronomical Society,https://twitter.com/astro_librarian

• Chetham's Library,https://twitter.com/chethamslibrary

• University of Kent's Special Collections,https://twitter.com/UoKSpecialColls

• The DigiPal Project,https://twitter.com/DigiPalProject

• Kew Gardens Directors' Correspondence,https://twitter.com/KewDC

• Sector Bijzondere Collecties van de Universitaire Bibliotheken Leiden,https://twitter.com/bcubleiden

• The John Rylands Library,https://twitter.com/TheJohnRylands

• Special Collections Team at Leeds University Library,https://twitter.com/LULSpColl

• Archives and Special Collections Service for Falmouth University and University of Exeter's Cornwall Campus,https://twitter.com/FXArchives

• State Archives of Delaware,https://twitter.com/DEPublicArchive

• Historic Libraries Forum,https://twitter.com/HistLibForum

• Medieval Manuscripts. British Library, London,https://twitter.com/blmedieval

• National Trust in England, Wales and Northern Ireland,https://twitter.com/NT_Libraries

• Manuscripts Online,https://twitter.com/MedMSSO

• SOAS Archives, University of London, https://twitter.com/SOASArchives

• Marsh's Library, Dublin Ireland,https://twitter.com/MarshsLibrary

• Special Collections of the University of Reading,https://twitter.com/UniRdg_SpecColl

• Robert D. Farber University Archives & Special Collections Department at Brandeis University,https://twitter.com/BrandeisSpcColl

• ROM Library, Toronto, Canada,https://twitter.com/ROMLibrary

• Providence Public Library Special Collections,https://twitter.com/TheSpecialest

• Saint Louis University Libraries Special Collections,  https://twitter.com/SLUSpecColl

• The Thomas Fisher Rare Book Library, University of Toronto, Ontario, Canada,https://twitter.com/Fisher_Library

• Cadbury Research Library: Special Collections, University of Birmingham, UK,https://twitter.com/CadburyRL

• Washington Rare Book Group,https://twitter.com/DCRareBookGroup

• Parliament Archives, UK House of Commons and House of Lords, Westminster, London UK, https://twitter.com/UKParlArchives

• Heritage Collections, University of Exeter https://twitter.com/UoEHeritageColl

• Wolverhampton Archiveshttps://twitter.com/WolvesArchives

• Anthony Mandal, out of the Centre for Editorial & Intertextual Research, Cardiff University, 

  https://twitter.com/CardiffBookHist

• County archives for the area of Tyne & Wear, covering Newcastle, Gateshead, N Tyneside, S Tyneside & Sunderland,https://twitter.com/TWArchives

• Fairground Archive, Sheffield, UK, https://twitter.com/Fairarchives

• CILIP Rare Books & Special Collections Group, https://twitter.com/CILIPRareBooks

• The Book History Research Network https://twitter.com/bookhistory 

• Archive and Records Management Services at the University of Dundee, https://twitter.com/UoD_Archives

• The University of Oxford partners of the Early English Books Online Text Creation Partnership. Based at the Bodleian Libraries. https://twitter.com/OxfordEEBOTCP 
• University College London Library Special Collections, London, https://twitter.com/ucl_spec_coll 
• The Reading Experience Database, based at the Open University, UK https://twitter.com/TheUKRED
• Special Collections of the University of Sussex, https://twitter.com/SussexSpeccoll
• Records of Early English Drama (REED), Toronto, Ontario, Canada, https://twitter.com/REED_Project
• The Radcliffe Institute’s Schlesinger Library https://twitter.com/SchlesingerLib
• The British Library Preservation Advisory Centre https://twitter.com/BL_PAC
• University of Bradford https://twitter.com/100objectsbrad
• Icon - the Institute of Conservation https://twitter.com/Conservators_uk
• Manchester Metropolitan University https://twitter.com/MMUSpecial  
• The John Johnson Collection, Bodleian Library, Oxford https://twitter.com/jjcollephemera 
• Arizona Center for Medieval and Renaissance Studies https://twitter.com/acmrs_org
• Gladstone's Library https://twitter.com/gladlib
• UNC Charlotte Special Collections https://twitter.com/atkinsspeccoll 
• Dedicated webspace for History of the Book events and resources throughout the UKhttps://twitter.com/hoboxford
• The Centre for Heritage Imaging and Collection Care,John Rylands Libraryhttps://twitter.com/CHICCmanchester
• The Bodleian Libraries of the University of Oxford https://twitter.com/bodleianlibs 
• The Irvin Dept. of Rare Books & Special Collections, Ernest F. Hollings Special Collections Library, University of South Carolina, Columbia SC https://twitter.com/UofSCRareBooks 
• The British Pathé Archive https://twitter.com/BritishPathe
• Transcribe Bentham A double award-winning participatory initiative at UCL, aiming to engage the public in the online transcription of Jeremy Bentham's manuscripts.UCL, London https://twitter.com/TranscriBentham 
• University of South Carolina's Digital Collections https://twitter.com/UofSCDigColl
• Archives for London https://twitter.com/archives4london  
• Gallica est la bibliothèque numérique de la BnF et de ses partenaires. France https://twitter.com/GallicaBnF
• The British Postal Museum & Archivehttps://twitter.com/postalheritage
• The Women's Library, https://twitter.com/WomensLibrary 
• Digital HumanitiesNow https://twitter.com/dhnow 
• Museum of Printing Preserving the history of the graphic arts, printing equipment, and printing craftsmanship North Andover, MA https://twitter.com/MOPrinting 
• Strathclyde Archives, Archives and Special Collections, University of Strathclyde, Glasgow, Scotland https://twitter.com/StrathArchives 
• Special Collections & Archives at the University of California, Riverside https://twitter.com/ucrspecol 
• Europeana, Europe's culture - collected for you. Explore more than 20 million items from a range of Europe’s leading galleries, libraries, archives and museums.https://twitter.com/Europeanaeu
• Elwyn B. Robinson Dept of Special Collections, U of North Dakota Library https://twitter.com/ebrspecial 
• Archives & Rare Books at UNT.Denton, TX https://twitter.com/UNTArchivesRare 
• Medieval Manuscripts, Walters Art Museum Manuscript Department https://twitter.com/MedievalMss
• Archival Platform: Networking, advocacy and research about archives, heritage and museums in Africa. Tweets by Harriet Deacon, UK correspondent, and SA team. https://twitter.com/the_archive
• National Archives UK, The National Archives https://twitter.com/UkNatArchives
• BBC Archive, Official Twitter presence of the BBC Archive.https://twitter.com/ArchiveAtBBC 
• Chawton House Library.Hampshirehttps://twitter.com/librarychl 
• Society of American Archivists, SAA, https://twitter.com/archivists_org 
• CulturaFonds Privately-owned rare books library. Home to many a humanist from the Southern Low Countries.Near Brussels, Belgium https://twitter.com/CulturaFonds 
•  Beinecke Rare Book & Manuscript Library at Yale University https://twitter.com/BeineckeLibrary
• The American Institute for Conservation of Historic and Artistic Works (AIC) https://twitter.com/conservators 
• Newberry Library, Chicago https://twitter.com/NewberryLibrary 
• Rare Book School, Charlottesville, VA https://twitter.com/rarebookschool 
• Archives Hub Manchester, UK https://twitter.com/archiveshub
• Sound Archive at the British Library (Richard Ranft), London, UK https://twitter.com/soundarchive 
• The British Library Keep up to date with all the news from the British Library https://twitter.com/britishlibrary 
• Feminist Library The Feminist Library is a large archive collection of Women’s Liberation Movement literature in London. London https://twitter.com/feministlibrary 
• The Morgan Private library of financier Pierpont Morgan—now a museum,research library,music venue,architectural landmark,& historic site. New York, NY https://twitter.com/MorganLibrary 
• Wellcome Library, London https://twitter.com/WellcomeLibrary 
• Binghamton University Libraries Special Collections, Preservation and University Archives Binghamton University https://twitter.com/buspecialcollec 
• Glasgow Women's Library, The GWL Kettle, Glasgow,https://twitter.com/gwlkettle 
• University Archives, The Ohio State University, Columbus, OH https://twitter.com/buckeyehistory 
• University of Wisconsin-Madison
• Archives, https://twitter.com/UWMadArchives
• Special Collections, Little Magazine Collection, https://twitter.com/UWLittleMags
• New York Academy of Medicine, Center for the History of Medicine and Public Health, https://twitter.com/NYAMHistory 
• The Centre for Reformation and Renaissance Studies, Victoria University in the University of Toronto, @crrs_toronto, https://twitter.com/CRRS_Toronto
• Brunel University, Special Collections, https://twitter.com/BrunelSpecColl 
• New York Society Library, New York, NY: https://twitter.com/nysoclib 
• University of Scranton Weinberg Memorial Library: https://twitter.com/UofSLibrary
• The Texas Collection, Baylor University: https://twitter.com/texascollection
• Ohio University Libraries Digital Collections https://twitter.com/aldenlibdigital 
• Ohio University Libraries Digital Collections @MaggieBoyd1873 Project https://twitter.com/MaggieBoyd1873
• Florida Memory, State Archives of Florida, https://twitter.com/FLMemory 
• Special Collections, University of Melbourne: https://twitter.com/UniMelbSpC 
• Special Collections and Rare Books, University of Missouri Libraries: https://twitter.com/MUSpecColl
• Beinecke Rare Book & Manuscript Library, Yale University, https://twitter.com/BeineckeLibrary 
• The Grolier Club, https://twitter.com/GrolierClub
• Albert and Shirley Small Special Collections at University of Virginia, https://twitter.com/RareUVA  
• North Carolina Collection, University of North Carolina at Chapel Hill: https://twitter.com/NCCollection 
• Southern Folklife Collection, University of North Carolina at Chapel Hill: https://twitter.com/SFolklife 
• Special Collections, Bridwell Library, Perkins School of Theology, Southern Methodist University: https://twitter.com/bridwelllibrary
• Libraries and Archives of the Autry, Autry National Center: https://twitter.com/LA_autry 
• NDSU Libraries' Germans from Russia Heritage Collection: https://twitter.com/GermanRussianHC
• Congregational Library and Archives: https://twitter.com/Congrelib
• Library of Virginia: https://twitter.com/LibraryofVA 
• Bernard Becker Medical Library at Washington University in St. Louis:  https://twitter.com/BeckerRareBooks
• Oregon State University, Special Collections & Archives Research Center: https://twitter.com/OSU_scarc 
• University of Texas At San Antonio. Redford Diaries: https://twitter.com/RedfordDiaries 
• University of Texas At San Antonio. UTSA Yesterday: https://twitter.com/UTSAYesterday 
• University of Victoria Libraries Special Collections http://twitter.com/UVicSC
• Center for Jewish History https://twitter.com/cjewishhistory
• University of North Carolina at Greensboro, University Archives http://twitter.com/UNCGArchives  
• University of Maryland-College Park, Special Collections and University Archives, https://twitter.com/HornbakeLibrary 
• University of Chicago, Special Collections Research Center, @UChicagoSCRC: https://twitter.com/UChicagoSCRC  
• Wake Forest University Special Collections & Archives, https://twitter.com/zsrspecial 
• Southwestern University Special Collections and Archives: https://twitter.com/SUspeccoll
• Free Library of Philadelphia, Rare Book Department: https://twitter.com/GriptheRaven
• Special Collections Research Center, George Washington University, @GWUSpecColl: https://twitter.com/gwuspeccoll
• District of Columbia Africana Archives Project (DCAAP), George Washington University, @DCAAP1: https://twitter.com/DCAAP1 
• La Salle University Archives, @LaSalleArchives: https://twitter.com/LaSalleArchives 
• Northern Illinois Digital Library: https://mobile.twitter.com/niudiglib
• The New School Archives & Special Collections https://twitter.com/TNSArchives
• University of Wisconsin-Milwaukee, Special Collections, https://twitter.com/uwmspeccoll
• Gilman School Archives, https://twitter.com/GilmanArchives 
• University of West Georgia, Annie Belle Weaver Special Collections, https://twitter.com/uwgSpecial 
• CUL Digital Collections, Southern Methodist University: https://twitter.com/SMUdigcoll 
• Palace of the Governors Photo Archives, New Mexico History Museum: https://twitter.com/pogphoto 
• University of Pennsylvania
• Schoenberg Institute for Manuscript Studies, https://twitter.com/sims_mss
• Colorado State University Libraries, https://twitter.com/CSUMorganLib
• George Mason University, Special Collections Research Center https://twitter.com/gmuscrc   

RELATED

• Antiquarian Booksellers' Association list of member booksellers on Twitter: http://www.aba.org.uk/links/138-aba-booksellers-on-twitter 
• Philadelphia Area Consortium of Special Collections Libraries (mostly RTs):  https://twitter.com/pacscl