The solution seems to be working towards a solution as YouTube revises its community standards, or Terms of Service. The key line is the note about "inciting others to commit violent acts or to violate the terms of use are taken very seriously."
There are countries in which free speech to incite others to violence is not protected speech. In Canada for example, freedom of speech is generally protected under Section 2 of the Canadian Charter of Rights and Freedoms. The Criminal Code of Canada, however, limits these freedoms and provides for several forms of punishable hate speech. The form of punishable hate speech considered to encompass fighting words is identified in Section 319. Free speech has its limitations when it is an incitement to violence against others.
Lieberman's point is along these lines. He stated: "YouTube was being used by Islamist terrorist organizations to recruit and train followers via the Internet and to incite terrorist attacks around the world, including right here in the United States, and Google should be commended for recognizing that." He added: "I expect these stronger community guidelines to decrease the number of videos on YouTube produced by al-Qaeda and affiliated Islamist terrorist organizations."