Here (plus the 570+ comments) and here.
In the outer vestibule of upper hell there are people who post under pseudonyms. You can keep track of them, and they're honest about what they think. They have reputations to maintain. Really, they can't be blamed. After all, it's odd to speak (under your own name) to the entire blogsphere. Talk about public speaking! Google makes it even worse. Plus, pseudonymists can have specific, perfectly good reasons to avoid using their real names. So--they're merely in the vestibule, but I'm afraid they don't get to lounge in heaven, nibbling on cotton candy for eternity. Being brave enough to use your own name has to have its rewards.
These people go by "anonymous" or "Fred" or "zippy," as it might be, but the main thing is that they don't always use the same name. So you can't keep track of them. They have no reputations to maintain, which can lead them into temptation. They'll wind up in the inner vestibule, next to the hot, hot door. If they're careful, it's not that bad. But cotton candy...no.
These people (odd that they even exist!--see preface, link #1) indulge a strange vice--they post on blogs using multiple pseudonyms, for purposes of associating their opinions with a multitude. They may even make their aliases talk to each other, for pleasing effect. Pleasing to whom? It's not quite clear. These people are deceivers, but also fools, since they confuse a true proposition with one that has many adherents. Sixth circle of upper hell, alongside the heretics, seems like a fitting place for them.
The Identify Thieves
Puppeteers who want to be taken especially seriously will sometimes resort to identity theft (amazing but true--see preface, link #2), claiming that one or their aliases is such-and-such a real person. Thus, the real person unwittingly becomes associated with whatever view the puppeteer is trying to promote. The torments of lower hell (alongside the thieves in the 8th circle) are a suitable recompense. Burns, festering sores, relentless itching, the whole nine yards.