To amend title 18, United States Code, to provide penalties for sex offenders who access social networks on the Internet, and for other purposes.

Sex Offender Internet Prohibition Act of 2007 - Amends the federal criminal code to impose a mandatory minimum prison term of five years and a maximum term of 20 years on individuals required to register as sex offenders who knowingly access a website with the intent to communicate with a child under the age of 18 years who is unaware that such individual is a registered sex offender.