Social media has played a role in popular uprisings in the Arab World since December 2010. But despite the buzz, only 0.26% of the Egypt population and 0.1% of the Tunisian population and 0.04% of the Syrian population are active on Twitter.
Twitter is most popular in Kuwait, where 8.6% are active users. In other social media uses, Facebook's popularity trumps Twitter. In UAE, there's some 36.18% of population on Facebook.
Khaled ElAhmad (who goes by the Internet alias Shusmo) created these two infographics, exploring Facebook and Twitter trends in the Arab world, using Visual.ly. His data comes from a Dubai School of Government report on Arab Social Media.