When users tried linking to the extension’s web page, Facebook denied them, displaying in an error message that the site contained a breach of the company’s security policy.
B.S. Detector was only blocked temporarily, although Facebook hasn’t offered a reason as to why it was curbed at all. The extension checks links on a given web page, then scans them for connections to unreliable sources. So if you’re reading a site that traffics in conspiracy theories and junk science, or state media from a shadowy authoritarian state, B.S. Detector calls its bluff.