> Hm these networks seem to go nowhere though. 2.5M is nothing compared to facebook. I'm not sure it matters that it's orders of magnitude smaller than Faceboo

> Hm these networks seem to go nowhere though. 2.5M is nothing compared to facebook. I'm not sure it matters that it's orders of magnitude smaller than Facebook, unless your goal is to replace Facebook with another equivalent behemoth. I think the more interesting question is how big does it need to be to have a self-sustaining community or otherwise to reach "stability". Nothing is forever, but I would guess there are some thresholds where the chance of outright failure drop significantly. I don't know where those thresholds are though.