Simply, Twitter is a social network that is oriented on micro blogging service. Twitter users have 140 symbols long message limit to post their Twitter status, news or any message they want. Twitter is like a short message news portal, where you and your friends will share your ideas and news in two or three sentences. Besides, it has a lot of competitors in the internet, Twitter remains the most popular. One of the factors for this success was the most appropriate time of its appearance in the web.
Just like Facebook appeared and gained enormous success leaving such monster as MySpace far behind, Twitter has gone to the unreachable position for its competitors. Just like any other social network Twitter is commercial and makes money on advertisement that it shows in its pages.