its a good idea in principle but in reality im not sure it would work, as i think has been mentioned elswhere its likely to turn into a bitching arena,unfortunately thats the nature of people.
probably the best thing is to get involved with local munches,decent groups and the like,i think you'd be far more likely to hear better advice, genuine experiences and knowledge of less than pleasant characters,most people who belong to groups like these are decent and want nothing to do with the idiots who give the lifestyle a bad reputation.
although there not going to know everyone obviously and there is always going to be many out there who are unknown.