Wow! Nice to meet you, Twitter teacher! Crazy that it's still the same three years on; I know what you mean that it's easier to talk about building a better flow than actually doing it, but I do think that it's fundamentally focusing on the wrong thing (from the outside in particular).

Perhaps this flow performs better than we think, but what I find most interesting about it is that instead of focusing on what you're interested in learning about/following, it instead just helps the bigger Tweeters get bigger/more famous, which is kind of sad, especially with many numbers suggesting that the average user has less than 100 followers.

I totally agree in terms of improving the product - it'll be interesting to see what Twitter delivers over the next year. I do hope that the focus shifts away from what it is now and more onto the intrinsic value of conversation/engaging with new people that in my experience seems to keep Twitter users active/proves the value to them.