I took a look at the Twitter CSS and it's completely diferent from the Twitter Bootstrap CSS. It doesn't use Bootstrap's grid system, and it isn't responsive.
Do they have anything in common other than the developers?
At Twitter, Bootstrap has quickly become one of our many go-to front-end tools when starting new applications and sites.
There's no difference. Twitter Bootstrap was the official name for version 1.0 (Twitter Bootstrap). Later the name has been shortened.
1. Anti-patterns. First off, Bootstrap supports far too many anti-patterns. An anti-pattern is a design idea that seem good, is reproduced often, but generally are bad ideas for a website.
With Bootstrap 2, we've gone fully responsive. Our components are scaled according to a range of resolutions and devices to provide a consistent experience, no matter what.
My answer at Quora:
Internally, we use it in a lot of applications. On Twitter.com, you can find bits and pieces in our dropdown menus, forms, and buttons.
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