According to Turkish media, there has been a "virtual war" between Greek and Turkish users of the site, with both sides posting insulting videos.
The clip prompting the ban reportedly dubbed Ataturk and Turks homosexuals.
Insulting Ataturk, the founding father of modern Turkey, or "Turkishness" is an offence which can result in a prison sentence. BBC
See You Tube below is a clip they can't see anymore...