Official ESO social media pages:

• Facebook: http://facebook.com/ESOAstronomy
• Twitter: http://twitter.com/#!/ESO
• YouTube: http://youtube.com/ESOObservatory/
• Vimeo: http://vimeo.com/esoastronomy
• Flickr: http://flickr.com/photos/esoastronomy/
• Your ESO pictures Flickr group: http://flickr.com/groups/youresopictures/
• ESO Hidden Treasures Flickr group: http://flickr.com/groups/esohiddentreasures/
• ISSUU: http://issuu.com/eso_observatory
• DotSUB: http://dotsub.com/user/esoastronomy
• ESO LinkedIn company account: http://www.linkedin.com/company/european-southern-observatory
• ESO on OpenLibrary: http://openlibrary.org/people/esoastronomy

Wikipedia presence:

• Main ESO Wikipedia page: http://en.wikipedia.org/wiki/European_Southern_Observatory
• ESO Wikimedia gallery: http://commons.wikimedia.org/wiki/Category:European_Southern_Observatory_Images

National ESO Twitter pages:

• https://twitter.com/ESO_Austria
• https://twitter.com/ESO_Italy
• https://twitter.com/ESO_Netherlands
• https://twitter.com/ESO_Sweden
• https://twitter.com/ESO_Chile
• https://twitter.com/ESO_Iceland
• https://twitter.com/ESO_Turkey
• https://www.facebook.com/ESOUkraine

National ESO Facebook pages:

• http://facebook.com/ESOGermany
• http://facebook.com/ESOIceland
• https://twitter.com/ESO_Italy
• https://twitter.com/ESO_Ukraine

Unofficial Facebook fan pages:

• The VLT Facebook page: http://facebook.com/esovlt?ref=pb
• The ESO Fan Facebook page: http://facebook.com/EsoFanPage?ref=pb
• The European Extremely Large Telescope Facebook page: http://facebook.com/E.EuropeanExtremelyLargeTelescope?ref=pb
• The APEX Facebook page: http://facebook.com/pages/Atacama-Pathfinder-EXperiment-APEX/141984649180307
• The ALMA Facebook page: http://facebook.com/ALMAfb
• The ESO Fans Facebook group: http://facebook.com/groups/ESO.Fans/
• The ESO Fans Facebook group: http://facebook.com/groups/10531085884/
• Visitas turísticas a Observatorio Paranal: https://www.facebook.com/groups/209811205785837/?fref=ts
• Paranal Interest Topic: https://www.facebook.com/pages/Paranal/108015062566236
• Paranal Observatory Interest Topic: https://www.facebook.com/pages/Paranal-Observatory/111063792279051
• Hotel ESO Cerro Paranal: https://www.facebook.com/pages/Hotel-ESO-Cerro-Paranal/119271901452823
• ESO Organisation: https://www.facebook.com/pages/European-Southern-Observatory/106068476092155?rf=214241635253989
• Leonhard Euler Telescope Interest Topic: https://www.facebook.com/pages/Leonhard-Euler-Telescope/113537165362753?nr
• VISTA Interest Topic: https://www.facebook.com/pages/VISTA/134875989879352?fref=pb
• Llano de Chajnantor Observatory Interest Topic: https://www.facebook.com/pages/Llano-de-Chajnantor-Observatory/134872013210746?fref=pb
• HARPS Interest Topic: https://www.facebook.com/pages/HARPS/143581472325752?fref=pb&rf=102639139790835
• Atacama Large Millimeter Array Interest Topic: https://www.facebook.com/pages/Atacama-Large-Millimeter-Array/137293229625356?fref=pb
• La Silla Observatory Interest Topic: https://www.facebook.com/pages/La-Silla-Observatory/132102713492661?fref=pb