Breakthrough of location based networking

This week Facebook announced the launch of Facebook Places, their take on location based networking. From this week on available in the USA, other countries to follow soon.
I was probably one of the first people in Belgium who really believed in location based networking while many others laughed and said it was "just a game".
Today I see more and more businesspeople check-in to their workplaces, their favorite restaurants and bars and even promoting those by giving tips to other users. Today...