West Warwick, RI
reply to Aj
Re: Blocking Facebook application using DSR-500n First, what do you mean by the "facebook application"? The facebook page? Or like a facebook App on a tablet or phone? If the former, yes, if the later, likely not very easily.
And when you say "only access to the wall" do you mean you don't have admin access to the router? If not, no, you can't and shouldn't change anything.