It’s called ‘a social club near you’ and can be anything from tennis, climbing, hiking, even binge drinking. In all seriousness though, for an app like that to be profitable, i.e. for someone to build it, there’d have to be a (relatively) high subscription fee. Since everyone wants every app to be free, the apps that try that business model typically fail. Plus you get a chicken/egg problem, everyone wants to log into the app and see lots of opportunity, which won’t exist for sometime given the literal paywall.