Some sweet providers post on BP. Some are ECCIE and even P411. The easiest way to "screen" them is to do a search of their telephone numbers or just ASK them how they can be verified. There is always TinyEye and Google.
I do NOT recommend seeing a girl you have NEVER seen posting before. Many have been posting for months and years, which IMHO would be a great reference and chances are if they have been around that long they will have a REVIEW somewhere.
Using BP and/or Moco as w/anything requires a little common sense to be succesfull and SAFE.