I completely understand the appeal of "quick blogging" like Tumblr and DailyBooth (for photos) for mainstream folks. Both are serving the masses i.e. people who have a lot to say, but don't necessarily have the substance to back themselves up.

They can quickly and easily post their thoughts to the world and get the instant feedback they need to feel heard in the form of hearts, pageviews, reblogs, photo comments, regular comments, etc. The feedback acts like a drug. All you need is a taste and you're hooked. If you don't get enough then you'll bother your friends to "please heart/comment/etc, my post". The act of asking and then receiving this drug is what keeps people interested. And that cycle never ends.

Tumblr (as much as I respect the hell out of the business they're making) is somewhat detrimental to people. I've seen it suck up peoples' lives like World of Warcraft or another game. I guess the same could be said of Facebook, MySpace, and others, though. Sorry for the harsh reality check.