Oh no, not more Twitter-related 'news'

It seems as if the two most significant areas where Twitter can provide actionable information are when a company representative speaks at a meeting or conference and provides information either negative or favorable about the company.  This can often happen unintentionally and the corporate executives can make a comment that will drive stock up or down, without even knowing it, such as when an executive demostrates that he doesn't understand his companies market.

Another aspect is measuring consumer sentiment and corporate goodwill.  More and more, consumers are interacting with brands via Twitter and the buzz generated can be an important indicator of future sales.

As to stock tips, they are probably the least reliable piece of information one can extra from Twitter.  People providing stock tips are most likely trying to drive the market one way or another and probably should be avoided.

For a final thought, I recommend Shel Israel's book, Twitterville:  How Businesses Can Thrive in the New Global Neighborhoods  

It explores the relationship between corporations and Twitter in a way that investors really should try to understand.

In the world of interruption v permissive marketing, I know where I'd class Twitter. I'm very picky about who I spent time following, and if they abuse my implicit trust, they're soon unfollowed.