Actor. A lot of peope know who he is, maybe not by name but have probably seen one of the shows he has starred in.
Almost everybody who owns a TV probably knows who she is.
The worst offenders were the ones who posted what look like paparazzi photos...oh look over there, it is someone famous sitting at a table 20 ft away...oh look they are serving themselves from the buffet...lets take a photo for facebook. I am sure that famous are used to this behavior, but I would like to think my own relatives would be a bit classier than that.