Tyler Cowen on Twitter:
Think of it as Google focused on one time-slice and giving the weight of crowd opinion no more than linear force. If an opinion is more common it will receive more tweets but otherwise your search brings up the splat, ordered by chronology, and thus it is more idiosyncratic than the first Google search page and often in a good way.
What’s interesting to me about Twitter is that it is different things to different people. Some people get lots of value from Twitter search — I hardly use it. But I find Twitter to be invaluable as a place to sound out ideas and keep in touch with people in my network. And I have very good luck seeking advice on Twitter.