Twitter is one of the hottest technology companies since Google and Facebook that has been influential in socio-political events. About half of Twitter's user base is from the United States. The document discusses Twitter's declining user numbers in 2009-2010, how its name was chosen to represent short bursts of information, how it works as a broadcasting system through its open source platform and API, how it differs from other forums and Facebook by being mobile-friendly and easy to make new connections, and how venture capital has invested over $250 million with potential for IPO by 2013. Apple has also discussed investing in Twitter.