Some free newspapers have a bulletin board space where people can essentially post personals to people they have met in passing, in the community.  Basically you get things like “I saw you at the coffee shop and I was wearing a blue trucker hat, yada yada yada.”  The thing about these is that they are completely catchy for people.  I don’t know if they ever actually work out but people love to read these things.

Social networking sites need to duplicate this type of activity but they can even take it a step further and tag those personal classifieds with additional data - venue, date, time, etc.  that would make them more easily queried.

If someone steals this idea and implements it, all I ask is that I be given credit.