Twitter:-

          Twitter is a free social networking and micro-blogging service that has changed the way people communicate with each other.

          Twitter is a ‘microblogging’ system that allows you to send and receive short posts called tweets. Tweets can be up to 140 characters long and can include links to relevant websites and resources.

           Twitter users follow other users. If you follow someone you can see their tweets in your twitter ‘timeline’. Registered users can post, like, and retweet tweets, but unregistered users can only read them.  Audio and video tweets remain limited to 140 seconds for most accounts.

          Twitter was created by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams in March 2006 and launched in July of that year.