sock account
A pseudonym or persona typically online, usually for some sort of deception. Usually accompanied by several other heads or socks. Sometimes also IP masked, which makes it more difficult to track. They maybe anon or with a developed backstory, but usually more false than not.
I don't know who it really was, they were using a sock account.
sock puppet account
A fake account run either part of a network of sock puppet accounts or just by itself run by one person
Jim was in his mom's basement making his 20 sock puppet accounts like his one post so he appears he has friends.
Sock Account
A sock, or socks, is an internet login used for two facing on the internet. A seemingly mysterious account with intent to badmouth, or cause chaos under the protection and safety of being snug within a sock. Socks are never "known brand" trolls that have notoriety. A sock seeks relevance, but, will never attain it due to its cowardly anonymity.
This sock keeps following me around from group to group trying to hump my leg. This sock account somehow knows who I am, but, obviously I don't know who it is. Socks and failtrolls go hand in hand.