Because I really want to fill my life with those awesome TechCrunch readers.
There's a massive flaw with all these location-based iPhone social networks. They attract only a limited subsection of the world; namely, people interested in location-based iPhone social networks. And you don't need gadgetry to know when there's one of those in the vicinity. Just look for the bloke who's got a TechCrunch T-shirt, an Apple logo imprinted into his hand and a bashed nose from walking into the lamppost while gawping at his location-based iPhone social network.