In the absence of any great social networking or Web 3.0 developments since Facebook, Twitter has appeared and become the Next Big Thing even though (go on, admit it), you Don’t Really Get It. I don’t blame you for thinking this, because in the virtual world, something has to be the daddy, even if it doesn’t deserve it.
If, like me, you read blogs by advertising mavens, marketing gurus and the gods of PR, you will know that Twitter is a much-discussed topic. After much argument, the opinions of the hundreds of conversation igniters have been dissected, examined and finally distilled into what can be safely considered the consensus view. So here it is, the definitive answer to the question: “How do I use Twitter for marketing and PR?“
How to use Twitter for marketing and PR
Published May 26, 2009 advertising , social networks 1 CommentTags: Twitter

Hi,
nice review. thanks..
Its also important that you don’t abuse Twitter for marketing and promoting your products, services or affiliate links. Most of your tweets should give your friends useful contents and valuable link or information.. Only once in a while should you try to use Twitter to promote something. Otherwise You will be marked as Spammer!
http://webmasterdailytips.com/2009/10/top-ten-ways-to-use-twitter-for-marketing