Twitter articles are popular here, as in other social news sites and blogs, because of selection bias. Who likes twitter? People who always have something to write. Who posts stuff on the web? People who always have something to write. It's the same reason most of the people who apply for a job are idiots, because they just have to do it over and over.

Overall, I think Twitter resembles the conference circuit. A small circle of people dominate the crowd's attention, largely by talking voluminously among themselves. You might be able to learn something new, but you'll have to filter out a lot of noise. And you're probably better served by finding a person or two and having an actual conversation, or writing an essay, or actually doing some work instead of being interrupted every few minutes.