Copyright 2010 ACM 978-1-4503-0099-5/10/10 ...$10.00.
approximately 75 million users as of 2010 [4]. These users actively publish short messages (“tweets”) of 140 characters or less to an audience of their subscribers (“followers”). With such a large geographically diverse user base, Twitter has essentially published terabytes of real-time “sensor” data in the form of these status updates.