The number of active Twitter users grew to over 100 million by September 2011, tweeting 1 billion tweets every five days. As officially defined by Twitter, an “active user” is someone who logs in (but does not necessarily tweet) once a month. Twitter penetration and uptake in the Arab region The total number of active Twitter users, tweets and top trends in each of the 22 Arab countries (plus Iran, Israel and Turkey) over the month of September 2011 was estimated using a Twitter API (application programming interface) specially developed for this research. The methodology used is detailed in Annex 1
