At the opening reception of the #ag2025goerlitz astronomy conference in #Goerlitz I spotted this poster about the benefits of the #Fediverse for #ScienceCommunication - great arguments but ... what about longterm stability? Will important and maybe even influential #Mastodon posts be still around in 5, 10, 50 years? On much-despised X - or FB - those from 10+ years ago are still around (if you know the URLs).