I've only tried using the ' discover nearby' feature, and haven't got anywhere with messages. Not many Chinese using that feature here, despite my poor technique.
Did once receive such a message, ' we have no money for food' or something. Turned out to be a travelling wg and the maid being bored on a Sunday and trying for custom ( off the books).So I went round, the wg was asking silly money and looked like a pirhana with lipstick: luckily I was saved by a punter turning up for her. This left me with the maid, I persuaded her to a hand job on the sofa for £20. Got her number and we had a bit of a friendship, she fed me and I got a couple of cheap fucks.