Twitter is an online social networking and microblogging service that enables its users to send and read text-based posts of up to 140 characters, informally known as "tweets". Twitter was created in March 2006 by Jack Dorsey and launched that July. Twitter rapidly gained worldwide popularity, with 200 million users as of 2011, generating over 200 million tweets and handling over 1.6 billion search queries per day. It is sometimes described as "the SMS of the Internet."
The PBS NewsHour is an American daily evening television news program that is broadcast on the Public Broadcasting Service (PBS), airing seven nights a week on more than 350 of the public broadcaster's member stations. As the nation's first hour-long nightly news broadcast, the program is known for its in-depth coverage of issues and current events.