No, once you post something on the forums it's there to stay. While CC claims no copyright on the forum posts we cannot mass-delete them upon request since this would damage the threads in which they belong and could derail an ongoing discussion completely.
However, if you post something like a short story or a poem in the forums and want that sort of material removed please send us a request with the url of specific threads and it's certainly something that we will look into.
Keep in mind that we will not do this for people willy-nilly. We will only do this if you intend to close your account and stop using CC.
Premium members can delete posts from the forum that they own.