Yes, members can comment on scenes.

RE: non-members. Here's the link. Not sure if anyone can post.
http://www.pornstarnetwork.com/video/mackenzee-pierce-12377.html
(for some weird reason, Maggie Starr's pic is the avatar for the scene but if you scroll down, you should see that it's the correct scene)

Comments should not be censored. I've never seen any censorship, for what it's worth.