It is a good idea and it isnt, i mean the celebs are also people and like privacy. I know some love interactin with fans but they can easily read what fans discussin without havin to get harassed. Some fans are genuine ppl and wont harass but u get some who are stalkers, such instances have already happened on Facebook . The celebs obvisously like to read opinions on their work so jus leave it at that, if it gets to point where they cant respond to everyone then they will end up not visiting at all.