For the 25-35 crowd I think there's a draw of "interesting activities for date night" that are low-commitment and could build a sense of community but don't require pre-planning. Really hard to build a business around, I know. But in NYC there are all these recent trends of run clubs, reading groups (events where people bring a book to a cozy location and collectively read with some mood lighting), and similar community-esque events that don't require anyone to interact but offer a forum for those that want it to happen. I was talking last night with a friend about dinner party services, which arrange for themed dinners, and we were saying how we would be interested in that but we wouldn't want to just meet random strangers, there would have to be some sort of draw to a theme or an interest group; otherwise we would just host with our own friends in our own networks. Meetup.com -- that came up in our conversation and neither of us had used it in years.