[ActVen]

Ask someone you know how comfortable they are writing/reading an article(blog entry). Then ask them how comfortable they are writing/reading a sentence(Tweet).

Twitter helped deal with the problem of many people being uncomfortable with expressing themselves in longer forms of the written word. It also works for those with short attention spans. Combined with a following mechanism, that has proven very effective.

[terrykohla]

It allows people who go more in depth into things (i.e. writing long articles, producing complex content) to use the more shallow masses to broadcast (retweet, comment, like, follow) their stuff. So everyone can can participate.