To hear investor Fred Wilson tell it, Foursquare’s heavily-publicized struggles have nothing to do with their product or their ability to raise funds. The real problem? Foursquare hasn’t done a good job communicating its killer use case: “maps with people in them.”

“It’s not really about the check-in anymore. It’s about ‘maps with people in them.’ And you don’t get ‘maps with people in them’ from Google, and you don’t get ‘maps with people in them’ from Apple, and you don’t get ‘maps with people in them’ from Nokia. You get ‘maps with people in them’ from Foursquare.