These aren't really good "social media" examples. Both mailing lists and Usenet have limited retention, with mailing lists there may be almost no retention beyond the amount required to deliver a message.
While low retention might be a desirable feature and something you might actually want in a FOSS social network, it means old content will disappear from the central server. If it's not archived by clients it can easily disappear or end up locked away only in private backups. Google's buyout of Deja News should be a cautionary tale of retention and the locking up of public data behind a private gate.
Usenet history today is largely only available because someone at Google hasn't noticed Google Groups still exists and terminated it yet. If that happens tomorrow there's not any good complete archive of historical Usenet content. There's no guarantee Google won't kill those Usenet archives in the next year let alone the next five years.
These aren't really good "social media" examples. Both mailing lists and Usenet have limited retention, with mailing lists there may be almost no retention beyond the amount required to deliver a message.
While low retention might be a desirable feature and something you might actually want in a FOSS social network, it means old content will disappear from the central server. If it's not archived by clients it can easily disappear or end up locked away only in private backups. Google's buyout of Deja News should be a cautionary tale of retention and the locking up of public data behind a private gate.
Usenet history today is largely only available because someone at Google hasn't noticed Google Groups still exists and terminated it yet. If that happens tomorrow there's not any good complete archive of historical Usenet content. There's no guarantee Google won't kill those Usenet archives in the next year let alone the next five years.