Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets". It was created in March 2006 by Jack Dorsey and launched that July. The service rapidly gained worldwide popularity, with over 300 million users as of 2011, generating over 300 million tweets and handling over 1.6 billion search queries per day. It has been described as "the SMS of the Internet."
Twitter Inc. is based in San Francisco, with additional servers and offices in New York City.
 You can find almost any celebrity there.
Here are some pages you could be interested in:
Arnold Schwarzenegger                       Dalai Lama                                 Lady Gaga

Britney Spears                          Joe Jonas                            Nick Jonas                 

Kevin Jonas                   Selena Gomez                       Fred Durst

Adam Lambert                        Eminem                               Avril Lavigne     

Justin Timberlake                         Rihanna            Shannon Leto