Seen on Message Boards and blogs and the like, the Ninja Editor is the type of person who makes a post, then almost immediately goes back to and then edits it quickly and without comment -- like a Ninja. This can get really, really annoying in certain communities (especially Livejournal) where you can now edit comments, as most people have settings that email the comments to them, so in the space of a few minutes you can have half a dozen of practically the same comment clogging up your inbox. See also Serial Tweaker. Contrast with Internet Detective.