Facebook content restrictions bypass Vulnerability: Blackhat Academy claims to have found a way to bypass content restrictions on links, as posted on their site and posts put on a user’s public wall. Facebook has only recently purchased Websense to attempt to push this vulnerability under the rug, however the exploit still works. To date (October 4, 2011), Facebook has yet to do anything about this. Attackers can misuse this during the creation of a malicious Facebook application or on the FQL development API page for information gathering.
Source: https://thehackernews.com/2011/10/facebook-content-restrictions-bypass.html