We told you this few years back (Are Facebook groups a threat to online classified space) and it was dissed off as 'heck ! just another feature at Facebook'.
But now, Facebook is going big in the classified space
--Given the lack of discovery and audience at Olx and Quikr, expect Facebook to create a serious dent in this space!
For flats this makes sense. Though for selling some good I don't know if I want a buyer to see my facebook profile. On the other hand if I am the buyer I do want to see someones profile.