As I wrote in my original post, I like site like Lunchclub.
Because it is a "single-player" experience where I don't need constantly be hyper-engaged, but can go in and say 'today I want to do x".
Which feels more natural to me.
Let's say I enter a lunchroom at work. There is Cathie from Accounting, Mark from Sales, and Marlene from IT. I can chose with whom I will eat lunch based on what I want to talk about that day. In opposite of yelling into the room / writing on the wall "Hey everyone, I want to talk about my a-ma-ze-ba-ll-s performance the other day" and then wait who replies / likes first to choose lunch.
