Twitter (http://twitter.com) is a free networking and micro-blogging service that allows its users..

Twitter (http://twitter.com) is a free networking and
micro-blogging service that allows its users to send and read other users’
updates, called “tweets.” Although Twitter has millions of users and is growing
rapidly, the firm has been criticized for not having a viable long-term
business model. Spend some time studying how Twitter does business. How does
the company earn money? Does it or does it not have a business model with
long-term potential?