I comment before reveals, but I usually wait until after to reply to a writer's comment if I'm going to. Usually I rec my gifts before reveals except that one year I got a coal treat I couldn't rec in good conscience, and thus did wait to see who they were. If I'm considering taking a rules violation to the mods though, I'm definitely waiting to see if they should have known better or not. If I can tell. (Which I didn't for that treat because I'm 99% sure they really were just new, incompetent and clueless.)