Twitter.com

Twitter is a free social networking website with micro-blogging facility. Twitter enables users to follow each other and  send and read each others' updates, known as tweets. Users can send and receive tweets via the Twitter website, Short Message Service (SMS) or external applications. The service is free over the Internet, but using SMS may incur phone service provider fees. Twitter was launched in 2006 by Jack Dorsey. In March 2009, a Nielsen.com blog ranked Twitter as the fastest-growing site in the Member Communities category for February 2009.

Website:

www.twitter.com

Founder:

Jack Dorsey