I imagine that it'd be fairly easy for a programmer to write such a script. In fact, I think it would work much like GoogleAds - based on the content/links of the page, GoogleAds chooses supposedly "related" ads; that is, ads that have paid to be related to certain keywords. Similarly, this "local.com" site could have a program setup to scan through bulletin boards and send messages through a dummy account based on the user's data. As a general rule, though, it may be unwise to post both one's full/real name and one's specific location. Country is probably safe.