Project Highrise might fit the bill - it’s pretty relaxed, and lasts forever.
The standard protocol for friends list and “who’s online” would be https://en.m.wikipedia.org/wiki/XMPP
Like https://en.m.wikipedia.org/wiki/Distributed_Interactive_Simulation or you mean the match-making protocol?
Introversion themselves talked about it at the time
War hospital puts you in charge of a WW1 medical camp trying to allocate limited surgeons, nurses, medical supplies as people come in injured from the front line.
I’ve sold or given away a few computers recently, and always remove the HDD first (and list it as such)
Obviously I don’t want some stranger to have all my documents - and deleting the data might not completely work.