Maybe something like the popular geo-caching but instead of geo-caches, one "finds" other people and activities and can then post about it...?
And there is something like meetup for example.
And there is something like meetup for example.
Kidding, but that's the kind of thinking that makes lonely people what they are. Its like depression; when you have it, it feels just too hard to do anything about it.
My response to all this is learning the games that make up surface-level social interactions and getting good at them. It is definitely faking it, but sometimes you stumble on someone who can talk and listen in equal amounts, at which point I know I can cut the bullshit.