...There are trolls who use dozens of different handles to pose as different people on various forums, or just coin a new handle to do their worst.
That happens constantly at the aforementioned blog. I don't understand why people do that. Perhaps because it's easy to do? They're bored?
After awhile you learn someone's posting style and even if they change monikers, you still know it's them.
I've never seen anyone here change monikers.