Comment by kukkeliskuu

The idea is to connect a little big larger groups that you have in mind, people that have something in common. Something like "single dog owners in Finland", "single people in Finland who like to hike", who have existing communities, for exmplae in Facebook. Such groups seem to have 1-10K members. I think the sweet spot is communities with so many members that simple Facebook introduction threads are no longer feasible, but people still have something in common that they strongly identify with.