State Kicks Sex Offenders Off the Web

In an attempt to keep sex offenders off Web sites like Myspace and Facebook, the New Jersey state legislature passed a law last week restricting Internet use for sex offenders who used the Web to help them commit sex crimes. The rule is being called an update to Megan's Law, which requires sex offenders to register after being released.

According to the New York Times, there are no federal laws restricting sex offenders’ use of the Internet, and Florida and Nevada are the only other states to impose such restrictions. My question is how effective is this going to be when simply keeping track of registered sex offenders seems to be too big a job in itself?