This problem seems like it would be perfectly solvable with an app, but one could argue that it's the increased usage of apps (rather than the in-person meeting) that got us here. Even apps like LivingSocial seemed to fizzle out relatively quickly, but mostly-messaging-and-narcissism apps like Instagram/Snapchat are the ones that came to stay. A part of me still wants to believe that some app that did nothing but mat…
https://news.ycombinator.com/item?id=17682648
The short of it is that any platform you build to make friends (at least if you take the naive approach and just build a dating app for friends) turns into a dating platform. It certainly matches how I interested I am in new people I meet online despite having a partner already. My hypothesis is that you typically have friendships with people of the same sex in a group (I certainly hear about people hanging out with "the lads" or "the girls" more than I hear about them hanging out one-on-one with same sex friends) and that isn't something any dating-app-for-friends has provided thus far.