Recently active topics in PBwiki tagged with ownership

Hi,

Everything in the terms of service (http://pbwiki.com/content/termsofservice) looks great. It essentially says I own everything that's added to my PBWiki. However, the following clause seems inconsistent with everything around it and makes me think I should pull everything off my site so that I won't lose intellectual property on my wiki. Can someone please explain the purpose and meaning of this clause? If I have information in a private wiki, does this give the company ownership and/or the right to distribute this information? Should I explicitly copyright my wiki pages? Does this clause override that copyright?

I'm hesitant to continue with my subscription without clarification. Thanks. Here's the clause:

"However, to enable Company to provide the pbwiki Service, you grant Company a worldwide and fully sub-licensable license to use, distribute, reproduce, modify, adapt, publish, translate, publicly perform, and publicly display your User Submissions (in whole or in part) in any format or medium now known or later developed."

When I tried to delete a page on monitorlmc, the message popped up that said I was only a contributor , not the creator. But I am. I created the wiki and manage it. Any suggestions?