Also, I'm Jason's business partner at Ramamia, and I developed the Twitter OAuth stuff for our app. I open-sourced the base code for OAuth/Twitter (written Ruby on Rails) we were using for it, and wrote a little app on top of it. Here's the github link: http://github.com/markbao/lightwitter/tree/master (w/ thanks also to kelliott who contributed fixes)
There's very few things I'd see Twitter competing against you with and doing themselves. They realize they are the telephone lines, not the telephone maker. It's why they haven't created an official Twitter client or really made huge improvements on their mobile interface (you can't even view protected tweets.)
You can also reach a lot more people with your twitter stream than Facebook. It's not uncommon for users to have 5k+ followers on Twitter. Up until recent that's been the MAX on Facebook. With the new redesign, we'll see.
So yeah, Twitter == LONG (mandatory that's what she said).