Today, the President signed H.R. 1865, the “Allow States and Victims to Fight Online Sex Trafficking Act of 2017” (commonly known as “FOSTA”). The law is intended to limit the immunity provided under Section 230 of the Communications Decency Act (“CDA Section 230”) for online services that knowingly host third-party content that promotes or facilitates sex trafficking. As drafted, the law has retroactive effect and applies even with respect to activities occurring prior to its enactment.