Twitter’s Dick Costolo Delivers on Change, but the Right Mix Remains Elusive
nytimes.com
nytimes.com
I'd propose doing something more radical for the onboarding process. Perhaps, they could show an almost random feed of tweets and rapidly update where the tweets are coming from by using a bayesian learning process. The point is you need to build your twitter from the ground up and not the top down.
I upvoted your other comment because it was a fine opinion and didn't deserve to get pushed down. On the other hand, I downvoted the above comment because complaining about downvotes doesn't add anything of use to the discussion.
Everyone gets downvoted sometimes; it's not a big deal, just a few fake Internet points.