<twitter> CURENTUL </twitter>
Twitter is ranked as one of the 10 most visited websites worldwide by Alexa’s web traffic analysis. Daily user estimates vary as the company does not publish statistics on active accounts. A February 2009 Compete.com blog entry ranked Twitter as the third most used social network based on their count of 6 million unique monthly visitors and 55 million monthly visits. In March 2009, a Nielsen.com blog ranked Twitter as the fastest-growing website in the Member Communities category for February 2009. Twitter had annual growth of 1,382%, increasing from 475,000 unique visitors in February 2008 to 7 million in February 2009. It was followed by Zimbio with 240% increase, and Facebook with 228% increase. However, Twitter has a user retention rate of 40%.
Twitter has been used for a variety of purposes in many different industries and scenarios. For example, it has been used to organize protests, sometimes referred to as “Twitter Revolutions” and which include the 2011 Egyptian protests, 2010–2011 Tunisian protests, 2009–2010 Iranian election protests, and 2009 Moldova civil unrest. The service has also been used in emergencies and political campaigning.