I have told my T about this PC and another forum I use is one he recommended. He has gone on the other one to see my post and what people were responding. We discussed it shortly. If something ever bothers me he asks I bring it to him to discuss it instead of keep it to myself and dwell on it. I've found my T very supportive of online forums and when I was opposed to them he was accepting of that too.

Had my T not been supportive I agree with previous posters I would continue it without telling them. I don't feel my T should ever tell me what I can and can't do that they should just discuss things with me and say their perspective but most things (not everything) I should have the final say. And that's how it seems for the most part unless it poses a risk to myself or others.