That's why you don't block; you flag. Let people make their own choices, but informed. Allow users to flag a link or post with tags such as Satire, Misleading, Controversial, Editorialized, Biased, Debunked, etc. Everyone else can still view the links and posts, but with some small indication of its trustworthiness. Though I feel like some tags, such as Debunked, should perhaps require a supporting link attached to a flag.