I actually did have Twitter. For two days. I followed all my favorite news accounts, and it was nice to have a centralized feed of <120 chars.
But then I was expected to follow everyone I had remotely known for the last 8 years. And they'd post the most stupid, blithely horrid posts I've ever seen. "OMG guys Saraaaahh iz mah bestieeeeeeee foreva love youhhhhhh" (wtf is up with the H's?) is pretty much the vernacular. What do you expect fresh out of teendom? I never expected REGRESSION, though...
Of course, if you only follow the news stuff and your own interests and use Twitter like a feed Flipboard, you're golden. But for me, by the third day, I was sick of the retarded One Direction and Justin Bieber trends in the "Now Trending" box and deleted my account.