Proximity social network applications - the future of Facebook?

Websites like meetups.com already provide a platform for likeminded people in a local area to get together. An upgraded version would bring this to a phone interface and locate meetups within easy distance of the user.

Would this be the AR application that takes over from Facebook? The proximity-based social network platform has a wealth of opportunities for convenient socialisation. This may be a natural progression of the Facebook platform or a usurper may capture the market.