This is not an official statement, just some thoughts.
In the past we have discussed the legal area involved with pictures coming from facebook. While many pictures may be coming from facebook the most important aspect of this site is that it's all user generated. Where the photo's on ratebu.com come from falls on the user uploading the content. While we screen for clearly illegal content the user uploading any photo's is accepting responsibility for where the photo comes from.
RateBU's concept comes from the site FaceMash featured in The Social Network Movie. With FaceMash Zuckerburg hacked into confidential servers and was charged with breach of security. With the pictures being attained illegally he violated individual privacy rights.