The first-ever European SpaceTweetup was co-organised by social media teams from ESA and the German Aerospace Center (DLR) in Cologne, Germany, on 18 September 2011, as part of German Space Day. Sixty keen Twitter users from across Europe, the USA and Canada, enjoyed a packed programme with 11 astronauts, ESA and DLR experts on Rosetta and Philae, SOFIA, Earth observation, as well as exclusive tours of SOFIA, the European Astronaut Centre and other attractions of Space Sunday.