Is the Arab Spring Falling Back?

This week The United States and the world watch with caution as unrest and deadly riots pop up throughout the Arab World. We speak, perhaps overly broadly, about the Arab street. Last week the specific streets in questions have been those leading up to US embassies in Benghazi, Cairo, Islamabad and Tunis. German and British embassies have been targeted as well. The cause is said to be a farcically inept but highly charged film portraying the Prophet Mohamed as an evil dunce. Is this the Youtube clip that launched a thousand protests, or is the tumult an indication of a wider frustration toward the West and the new governments in place in several Arab Countries? Who's behind the riots? How should the US government respond?