Say you're in and if you see another on the thread who catches your eye send them a pm to let them know and a wink.
If you receive send a reply even if it's a polite no thanks!!!
Who knows?? I've met some fab people just by starting with a hello!!!
I have always found that a polite, properly spelled message gets the best results.
Always more likely to get a response than the usual "wot u into" I find.
Certainly from me anyway!