GoodReads is great, but what about COPPA?

I have been on GoodReads for several years but did not really use it until the past six months or so. I enjoy the Mock Newbery group, and it is helping me keep track of the myriad of kid's books I read. The problem I have with GoodReads, all social networking sites really, is the terms of use concerning COPPA. According to this law, social networking sites cannot collect personal information about children under 13 without parental permission. Social networks have found that the easiest way to comply with COPPA is to merely ban kids under 13 from using their site. This technically gets them off the hook legally, but does not really address the real issue of use by children under 13. I an seeing younger and younger children using Facebook to communicate with family and friends and to play games. Sometimes they are doing it with their parent's permission, sometimes not. These sites to not effectively block kids from using them, and even encourage kids to lie about their age. As a youth librarian who spends most of her time serving kids under 13, I want a "GoodReads" that they can use.

If a library is using Library Thing to allow patrons under 13 to review a book in their catalog, aren't they violating the terms of use? I am definitely not arguing the validity of the way social networks use terms of use as a way to avoid assuming any responsibility for under 13's using their site. Neither COPPA or social networks are "getting it right."