The law’s central provision holds that websites (and their users) cannot be treated legally as the publishers or speakers of other people’s content. In plain English, that means that any legal responsibility attached to publishing a given piece of content ends with the person or entity that created it, not the platforms on which the content is shared or the users who re-share it.

The seemingly simple language of Section 230 belies its sweeping impact. Courts have repeatedly accepted Section 230 as a defense against claims of defamation, negligence and other allegations. In the past, it’s protected AOL, Craigslist, Google and Yahoo, building up a body of law so broad and influential as to be considered a pillar of today’s internet.