I would like +foursquare to easily answer these questions for me:
– Where did I (or my friends that are vegetarian) eat last time they were here?
– How many times was I in the gym this month?
– How many miles/times have I traveled this year?
– Which cities have I visited this year?
– Where do my friends usually go for breakfast / lunch / dinner / party in Hamburg? (I don't care about "other people", I care about my friends)
The data is there, Foursquare. It's time to make something useful out of it!