Twittering with popular people or celebrities..

[MagusKnight]

Twitter is more instant, and not everyone has some of the basic needs for podcasts and vlogs and whatnot.
Besides, twitter takes a sentence, and a click, and you're not.
Podcasts: Take too long to make just a quick sentence...
Vlogs: Same deal...
Blogs: Well, it'd be pathetic if you saw a one sentence blog.