""Actually I do have an idea who might hide behind that mask; the elves can check the IP addresses and pronounce their usual warnings (as they did long ago when someone else posted from my computer).""

Hmmmm!

Who else do we know, who has claimed to be victimised by some unknown person using his computer to post untruths?

If such were the case, all that the elves could ascertain is the fact that it was your computer.

They could not ascertain whose fingers were on the keyboard.

They might warn others that it might not be you, but that would be mere opinion unsupported by evidence, and therefore meaningless.

Don T.