Twitter is an online social networking site and microblogging service. Twitter is made by Jack Dorsey in 2006. Its headquarters in San Francisco, California, United States. Jack Dorsey is the Chairman and Dick Costolo is the Chief executive Officer of this site. According to 2012 report the twitter has 900 plus employees. Twitter's logo is a bird. Twitter became so popular with over 500 million registered users in 2012. Its user are capable to send and read text messages with 140 characters limit, that known as tweets. Twitter is the best way for a family and friends to keep in touch, a company to coordinate business, the media to keep people informed, a famous personality also connect to fan. In starting, Twitter had over 340 million tweets daily. The twitter became most visited website on the internet. The postal and official address, email address and phone number (helpline) of Twitter service center is given below. The helpline of Twitter service center may or may not be toll free.