I think what he means (and I am amazed how many punters do this in their reviews or comments) is post information which ids themselves. Like I saw this girl on this date at this time or any other info which the girl can use to id the punter. Especially if a bad review. The girl in question could be angry and then cause problems for the guy later on. She knows your number and maybe other stuff like your car plate number.
Even if it is a good review, a punter may reveal too much info about the girl, like private info which the girl does not like.