ASSOCIATED PRESS PHOTOGRAPHS
Ujjwal Singh, here with fellow Google employee Steve Crossan and Twitter Vice President Katie Stanton, devised a way of letting fans share voice messages with celebrities; it has been repurposed to help Egyptian protesters.
Chef Graham Elliot uses his Twitter account at his restaurant in Chicago, but also tweets about current events and fantasy football picks. He even uses Twitter to let his followers make decisions about the music the restaurant plays. (Associated Press)
Twitter co-founder Biz Stone, left, talks about changes to the social network at Twitter headquarters in San Francisco, Tuesday, Sept. 14, 2010. Twitter is turning its short-messaging website into a multimedia showcase by adding a new pane that will make it easier for its 160 million users to peruse photos and video. (AP Photo/Marcio Jose Sanchez)
This screen shot taken from the microblogging site Twitter.com early Sunday morning Aug. 1, 2010 shows the Twitter page that greeted users announcing Twitter being down for planned maintenance. According to Twitter the maintenance is scheduled between 2 a.m. 7 a.m. EDT Sunday. As such in that time some users will not be able to access Twitter. (AP photo)