Three online dating giants agreed to screen for sex offenders and take other safety steps after a woman was assaulted on a date, California Attorney General Kamala Harris announced…Match.com [part of IAC], eHarmony and Spark Networks signed a joint statement of business principles intended to provide an example for the industry and help guard against sexual predators…Among other things, the companies agreed to check subscribers against national sex registries, supply members with online safety tips, and provide a quick way to report abuses…The statement is nonbinding and carries no enforcement penalties, but it does publicly hold dating sites to account for their members' safety…