Every friendship I've ever established has been based on some activity: sharing an office, playing sports, watching a movie, etc. And I don't think I'm unique in this respect.

Meeting a person solely for the person of selecting him or her sounds very specific to dating.

I think your project is interesting and has a lot of potential — I'm just pointing out that, by downplaying activities, you may be expecting a type of socializing that's unnatural to many people, especially if you hope to differentiate yourself from dating sites.