Follow today’s tweetup via any of the following accounts/channels.

Twitter accounts (roughly in the order of update frequency):

@social4space, @esa_eo, @Paxi_ESAkids, @ESA_IT, @esaoperations, @esa

Official hashtag: #LucaTweetUp

Google+: ESA G+

Flickr: esa_events

Facebook: Friends of ESA