FT
The Financial Times has posted a very long analysis on Twitter as a social phenomenon:

“In its deceptively simple way, Twitter has stumbled on a formula that a whole generation of recent web start-ups has been searching for: a way for people to connect with friends, express themselves and find information that stands a chance of one day becoming as popular as other mass online trends such as blogging and social networking.”

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If you are on Twitter, check out the Twitter feed of the author of Putting People First.