Please do not add any more categories to pages. The "Moviepedia" category isn't necessary because there would be over 13,000 pictures and pages in it. That would make it pretty much useless as a category. There is other cleanup that has to be done on categories, so the fewer categories that are added, the easier it will be to clean them up.
Also, what I have found is that the people that only add categories and don't make any other kind of edits dont' really help a wiki. It just tends to get cluttered when this happens.
About a week ago, I made category spamming an official reason for being blocked on another wiki. It is now an official reason here as well. I did not notify you about being blocked for a month, but today's block is for three months. Next time, it will be for six months.