Board Thread:Show-Related Questions and Answers/@comment-1916997-20160316060423/@comment-24674051-20160317164721

Actually, you can. Writing false information about someone falls under the category of libel. The process is ugly (just as it is for hard copy libel in newspapers and magazines), but there is due process that is available.

The problem is that it's expensive, and opens a lot of doors that people (like politicians and entertainers) would prefer to leave shut. So the matter is usually either ignored, or settled on the side. Which is why the papparazzi flourish, and have since before the dawn of the digital age.