Outside of that, here's my dilemma; even if I was crazy social, Facebook/FourSquare/Gowalla know where I am and offer me more incentives to post my locations and activities through them. What does this offer me? The problems you list that motivated you to create this app are easily solved by ignoring your phone or sending texts. If I'm busy, I'm too busy to update an app my friends probably won't even check. If I'm relaxing, I don't want people to know where I am and what I'm doing because I'm trying to relax. Ignoring them, which is the current method for handling these problems, is easier to do than what you are proposing.
I think you need to find a better reason for people to use something like this, which I think would be more relevant to families and possibly remote co-workers, and go from there.