yes and no, the moderators (who are o2 staff) do monitor the forum to make sure you do not generally bad mouth o2 and that you do not break their t&c, however they are not responsible for answering questions, the forum is there to allow us to answer eachother's questions and share our experiences.
as one of the moderators put it "I'm afraid the moderators can't help with specific problems - that's not our role here. Nor can the Forums work as a back door into Customer Services. Whenever you are having a problem with an O2 product, then you should call CS and have them resolve it. What the forums can do is show you when other users have had similar experiences, and what they did to get over them. That might just save you the call, and a chunk of time."
which is fair enough really...