Interestingly, they define social network as "an Internet website containing profile web pages of the members of the website that include the names or nicknames of such members . . . or any other personal or personally identifying information about such members." You know as well as I do how many websites that defines nowadays, with more sites adding a social aspect to keep up with the times.
The powers-that-be appear to be growing more aware of the impact of social networks, and are responding accordingly — see the US Marines' ban. This law, though, has a different purpose entirely: protection of minors. Do you think it will be effective?