Belinker is like Dodgeball, but for China: via SMS, it alerts your nearby (within 1500m) friends as to your whereabouts, and you be will alerted to crushes (or in Chinese, 梦中情人) nearby.
You have to sign up on the internet first and there’s a fee if you send more than 50 “belinkers” a month.
Its currently offered in 8 cities (the big ones).
As an aside, I’m always interested by how they presented their imagined users: