Not everyone is comfortable sharing their precise location, even with their friends; if you’re not, you may well wonder why people actually use location-based social networks like Foursquare or Google Latitude, or enable location sharing on Twitter or (soon) Facebook. The reasons for using location-based services, ReadWriteWeb suggests, include managing social contacts (the textbook use is serendipity: suddenly discovering that a friend is nearby), gaming, and tracking your own movements for future reference. Via All Points Blog.