Shadow banning (also called stealth banning) is the practice of muting, hiding or blocking a user or their content (mostly on social media) without it being obvious that their content is being blocked. The goal is to discourage users from attempting to circumvent or react to the ban. It is a controversial practice since it does not require companies to explain or justify their decisions, and makes it difficult for users to understand if their content is being blocked or just merely uninteresting to other users. Ironically, this page itself is currently shadow-banned on Facebook (try posting a link on Facebook).