Why not bring back messages but put a crowd sourced spam filter in? Instead of matching profiles, match messages, people looking for long term populate one set

Why not bring back messages but put a crowd sourced spam filter in? Instead of matching profiles, match messages, people looking for long term populate one set of bayesian filters, and people looking for short term populate another set of bayesian filters. The spam cut and paste message go away pretty quickly. The mechanism could be as simple as after a message is read they are prompted as to whether they liked the message or didn't like it, combine with a feature sorting messages by their bayes score?