S.431 - Federal Government - A bill to require convicted sex offenders to register online identifiers, and for other purposes.

Keeping the Internet Devoid of Sexual Predators Act of 2007 or the KIDS Act of 2007 - Amends the Sex Offender Registration and Notification Act to require a convicted sex offender to: (1) provide for inclusion in the National Sex Offender Registry any electronic mail address, instant message address, or other similar identifier used to communicate over the Internet; and (2) keep such information current.

Requires jurisdictions that maintain information about sex offenders to exempt from public disclosure any electronic mail address, instant message address, or other similar Internet identifier used by a sex offender.

Requires the Attorney General to maintain a system to allow commercial social networking websites to compare their databases of users to the Internet identifiers of persons in the National Sex Offender Registry. Exempts such websites from civil liability if compliant with the requirements of this Act.

Amends the federal criminal code to impose a fine and/or prison term: (1) of up to 10 years for failure by any sex offender to provide information required by this Act; and (2) of up to 20 years for age misrepresentation with the intent to use the Internet to engage in criminal sexual conduct with a minor.