"Marc Lynch, an expert on Middle Eastern media at George Washington University, says social media and satellite television worked together to draw attention to the Arab spring. Social media spread images of protesters in Tunisia that might otherwise have been suppressed by the regime, he wrote on his blog at Foreign Policy. 'But it was the airing of these videos on Al Jazeera … which brought those images to the mass Arab public and even to many Tunisians who might otherwise not have realised what was happening.'
"The staff in Al Jazeera’s Arabic and English newsrooms had, as it happened, undergone intense social-media training only the month before."
(Published July 7, 2011.) This is an excellent article from The Economist, focusing on the relationship between journalism and social media.