Twitter operates a free digital service site that blends social networking with the ability to post short messages (or micro-blogs) limited to 140 characters or less, commonly known by users as "Tweets".
After establishing a Twitter account at www . twitter . com , individuals can import their e-mail addresses as well as use the Twitter search to locate and invite people. Twitter messages ("tweets") can be made public and sent to anyone requesting the feed, or they can be sent only to approved followers.
Twitter added a reply function that turned Twitter into a discussion group service. When someone replies to a Twitter posting, they use their Twitter account name preceded by an @ sign .
Twitter became a viral conduit when users initiated “ retweeting ,” which forwards tweets they get to their followers. People retweet to pass on worthwhile information, and the ease of retweeting can quickly build large audiences.
“ What we have to do is deliver to people the best and freshest most relevant information possible. We think of Twitter as it’s not a social network, but it’s an information network . It tells people what they care about as it is happening in the world”.