Hacker News Reader

The media understand nothing about that part of the Internet.

First rule of fight club...

Users on 4chan are by default anonymous when posting content or comments (replies to content). At least when I last spent time there (in early 2007) it was considered a faux pas to post content with a username as it is looked as if one is trying to gain notoriety/fame for themselves, instead of giving up their content for the great good that is Anonymous.

Anonymous (capitalized) is, generally speaking, not a coherent group in any sense, but a meme describing the swarm of memes and the users who propagate them (often first at 4chan) through the internet (a meta-meme?).