Twitter demands that your posts remain at 140 characters or less. Darlene Victoria of D Victoria Virtual Assistance writes of her initial difficulty keeping within the Twitter limits.
At first, I, too, experienced some of that difficulty. And I was overwhelmed by the sheer volume of posts and traffic. It's quite a big world out there.
But after using Twitter for a few days, I began to find the short posts liberating. Condensing thoughts into a few words forces you to get to the core of your message--and eliminate the non-essentials. And one can always link to an article, a blogpost, etc.
If anything, it seems almost too easy to come up with a throw-away line or two. And many are the tales told of those who have posted with abandon only to regret their hasty words later. Such as the juror who twittered during the Vince Fumo trial in Philadelphia. It turned out his posts were harmless--and the judge saw no need to void the results of the lengthy trial. But you get the idea.
Still it is nice and freeing to write a few words and send them out to the world--and then see what results come back. And it is a quick way to cut through clutter and communicate.
To sum up, Twitter does have its place.