It's been an interesting week for Foursquare, the location-based social networking site.
On Sunday, Foursquare might have been referenced on an episode of "The Simpsons" that was filled with Twitter and Facebook references. On Monday, TechCrunch reported that Digg founder Kevin Rose outed himself as an investor in Foursquare while he was at the Future of Web Apps conference in London. And on Tuesday, Foursquare announced that London will be added to the growing list of cities where its service is available.
Through a tweet, Foursquare announced that it will be bringing the service to London this week. This is Foursquare's second European city. Amsterdam was first, but London is a whole different animal. London is the top Twitter-using city in the world, so people may be open to a new social service like Foursquare.
Meanwhile, Rose is the latest Foursquare seed round investor to go public. Last week, it was revealed that Twitter creator Jack Dorsey was part of the round, along with Union Square Ventures and others still undisclosed. Rose's involvement definitely adds some star power to a service that has been growing in popularity. Rose's investment was revealed through a slide in his FOWA presentation that can be seen in a video of his talk at 50 seconds in.
Finally, Sunday brought some fun news for Foursquare. A new episode of "The Simpsons" includes a scene in which Lisa remarks: "Nobody even plays foursquare anymore, they just gossip." It's a pretty loose reference, but some people believe "The Simpsons" gave a nod to Foursquare.