Over the last six months just about all of my tech friends have started using Foursquare , a geolocation-based game that was built by the creators of Google-acquired Dodgeball. Some of them will literally pull out their phones as soon as they enter any restaurant, event or even TechCrunch HQ and check in just so they can be named 'mayor' of that establishment (whoever checks into any particular location the most times becomes mayor of that location). It's fascinating and a bit bizarre to watch, and it clearly shows that Foursquare has tapped into something powerful. But all this time I've had a nagging feeling that Foursquare, at least in its current form, is not going to be the next Twitter , as some people have concluded. Because as good as Foursquare is at figuring out where and what your friends are up to, they can't hope to compete with Facebook. That is, if Facebook does Geo right. While the world's largest social network has been almost totally silent with regard to its plans for geolocation, we've been hearing an increasing number of rumors about Facebook finally coming close to launching these features. Such rumors have come and gone for a long time, but all signs point to the most recent batch being true.