Maybe the content didn't have a proper copyright:
From the fanpop Terms and Services:
link - bạn understand and agree that fanpop may review and xóa any Content (Fanpop, links, images, profiles, comments, postings, messages) that in the sole judgment of fanpop violates these Terms of Service hoặc which might be offensive, illegal, hoặc that might violate the rights of, harm, hoặc threaten the safety of other users hoặc members of the fanpop Site and/or other website users.
- bạn may not post, distribute, hoặc reproduce in any way any copyrighted material, trademarks, hoặc other proprietary information without obtaining the prior written consent of the owner of such proprietary rights.
Also, did any of the content fit this criteria:
The following is a partial danh sách of the kind of Content and communications that are illegal hoặc prohibited on/through the fanpop Site. fanpop reserves the right to investigate and take appropriate legal action in its sole discretion against anyone who violates this provision, including without limitation, removing the offending communication from the fanpop Service and terminating the membership of such violators hoặc blocking your use of the fanpop Service and/or fanpop Site. bạn may not post Content that:
is false hoặc intentionally misleading;
- is patently offensive to users of the fanpop Site, such as Content hoặc messages that promotes racism, bigotry, hatred hoặc physical harm of any kind against any group hoặc individual;
- harasses hoặc advocates harassment of another person;
- involves the transmission of unsolicited mass mailing hoặc "spamming";
promotes illegal activities hoặc conduct that is abusive;
- is threatening, obscene, defamatory hoặc libelous;
- is pornographic hoặc sexually explicit in nature; and
seeks hoặc recommends providers of material that exploits people under the age of 18 in a sexual hoặc violent manner, hoặc seeks hoặc recommends providers that solicit personal information from anyone under 18.
If bạn were not notified of the reason for the removal in a e-mail hoặc other, then bạn should probably notify the Owners of Fanpop. It may be a mistake.