Doug asked "Are those who twitter technically twits?". It's a great question. A post over at AASLBlog drew a lot of comment from those who are twitter-pushers, mostly claiming that they don't really push twittering, they just heavily endorse it (and other 2.0 "tools").
There's a part of me that feels that I've been visiting this question for a while. You see, my parents don't twitter, but they do photograph. With the rise of easy-to-use cameras (as opposed to the 35mm Pentax my father gave me when he discovered good load-and-shoot and then digital cameras), it's no longer An Occasion that gets documented. It's everything. Lunch with friends? Take a photo - even if these are friends you lunch with weekly. Grandchild's first step? Take a photo - and make sure you get several of both left and right steps. Grandchild pointing adorably at some unknown object? Photo op! When traveling, make sure you take plenty of photos of you and/or your travel partner(s) in front of the Impressive National Monument/Scenery/Ruin because that's really what people want to see: that you were there, not the actual there part.
It's not living life, it's documenting it for future digestion. Ditto twittering. If you actually have a life, if you're busy living and doing and meeting and reading and so forth, you don't have time to twitter it. You don't have a need to twitter it. But if you need to Let People Know that You Have A Life, then you're twittering madly. This isn't to say that all photos are bad, or that all twitter posts are bad. But really - too much of anything isn't good.