Backbiting, backstabbing, or tale-bearing is to slander someone in their absence - to bite them behind their back. ... In the Baha'i Faith, Christian, Islamic and Jewish doctrine, backbiting is considered a sin. -- Wikipedia
In today's world, we can talk negatively about someone anonymously online, where the victim could view said post. In this sense the "...in their absence" criteria no longer holds (at least partially).
Question: Is backbiting from an anonymous online account still backbiting? Is it classed as something else?
I presume it's just as sinful (if not moreso) than traditional backbiting.
(There appears to be a YouTube video which might answer this, but YouTube is blocked in China so I don't have access.)