Twitter is really What you want it to be...
http://www.cmswire.com/cms/micro-cms...ing-003973.php

A Smart innovative Communications Tool that really took off in the Online world... Got Just the right Buzz and PR going for it Since 1st Arriving...

In other words The Google of Communications tools... Similar to Matt Mullenweg's wordpress Success story...
http://ma.tt/about/

If you research and Digg through... Twitter As A Search Engine......

List of PR9 sites

1. adobe.com
2. altavista.com
3. amazon.com
4. apache.org
5. apple.com
6. berkeley.edu
7. bloglines.com
8. cbsnews.com
9. cdc.gov
10. cisco.com
11. cnet.com
12. cnrs.fr
13. com.com
14. cornell.edu
15. creativecommons.org
16. dhs.gov
17. elsevier.com
18. energy.gov
19. epa.gov
20. ercim.org...