Poken seems to be a snowball/network effect type of product (as most social networking is). It's useless to have unless people you meet have it, but it's an absolute must-have if people you meet have it. I can see this snowballing pretty big once it gets started within even just a small circle here. Give it away for free to 10,000 people within a small office area of New York City, sit back, and watch what happens IMO