It sounds like friender or meetup. There is even one for people with dogs look to find other people to walk and socialize their pets.
That said, they are very basic, and expanding on just finding a friend and help personalize going out or doing stuff would help most people. Can't tell you how often i meet someone and we kinda hit it off, but you don't want to seem like a weirdo and try and go do stuff with them, so you never ask. Maybe something that takes everyone's location, interests, and tries to plan a day out for everyone.