Digital spit, be careful, most block software reports to an admin any site not blocked but containing a keyword.
"Forum" is one of those keywords, and don't think your admins won't know.
If they look.
Not all really look, and try to rely on the software.
Just warning.
(I know because of my career..part of a small focus team of a larger team of IT geeks supporting hundreds of other IT geeks who think they get away with much that they really don't but sometimes is used to build up 'cases' of lots of little things that is often used during performance reviews)
(It's scary what I've learned as I've climbed the ladder, and think back "I got away with that?! Wow!")