In its almost six-year journey to gaining 100 million active users, Twitter has attracted a slew of celebrity users and well-known agencies. This year was no exception as big names from all walks of life -- TV, music, politics, religion and sports -- saw the social network's potential to boost their careers or help their social initiatives.
Twitter is highlighting its growth and significance with a Year in Review series in which one part shows off the celebrities that have joined Twitter in 2011. We whipped together the gallery above to help you decide whether you want to follow any of Twitter's fresh faces.
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