I'll admit to not even looking at these services in a very long time, but OKCupid had experimented with setting up the first date more spontaneously, but it was

I'll admit to not even looking at these services in a very long time, but OKCupid had experimented with setting up the first date more spontaneously, but it was before ubiquitous smart phones so they didn't go very far with it, IIRC. If you had the app on, and it knew you were in proximity to some sort of match, then it could notify each party and provide a message like, "would you like an introduction to so-and-so? You're both within walking distance of an art exhibit - meet a new person and enjoy some fine art!"