Ok. If I might make a suggestion: delay the location data by a random amount, the random amount should be user configurable for different locations (minimum+variation).

I've been thinking about this particular problem for quite a while because of an idea we had about two years ago called 'lifeyarn', the plan was to couple mobile pictures with date, time and locationstamps into a threaded representation of your life. You can then use the threads to meet people and do all kinds of interesting things with them (who was where on what day, who attended that dinner and so on).

The possibilities for abuse are endless, you really have to be careful with that and pro-active, don't wait until a bad thing happens and then plug the hole.