ESA is a user on apoil.org. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
RT @esascience: Happy anniversary Mars Express, launched #OTD in 2003 🎉 Celebrating 15 years of this extraordinary mission with a striking… source: https://twitter.com/esa/status/1002840022960271361