Tweeting and writing

Does twitter have an effect on how we write?

I've read on how text messaging has affected the ability to write negatively. Also, oddly enough, you could find views online that the effects are generally positive.

I would understand that texting would severely affect the writing style of people, but how about tweeting? It's essentially the same thing, but with a wider audience. Instead of communicating one-on-one, as in text messaging, you broadcast your tweet to the world. Would tweeting have an effect on how we think and how write?

I'm going to read up some more and try to write something more coherent next time.