While most posts are touching on privacy or failure cases, I am still struggling to understand this product from a social perspective. First of all, this general idea has been floating around since companies like loopt, when mobile started taking off. I remember working through the use case considerations for this kind of product, and that's where it really dies.<p>This breed of product is based on the idea that location = event. If someone is at a location, that means something is going on. But it ignores massive implicit social constructs: 1. Facebook friends are not real friends (Circles is slightly better but classification is onerous), 2. Someone you don't know well is unlikely to share their location to you, and less likely to agree to hang out based on location, in contrast someone you do know well, you will easily be aware of their location and availability.<p>The reality is that this product captures one piece of information - where is my friend right now. But on any serious reflection, you should be able to discern that this piece of information is incredibly secondary to the nature of the actual relationship when determining whether or not to hang out.