The TOS on quoting someone? You're saying that if I want to quote something someone says on Twitter in my book or in a newspaper, I have to follow their TOS and style it their way? No, I think not. Applying Twitter's styling to quotes is a nicety. It's nice for the blogger that it looks good on a blog and it's nice for Twitter that they get a link back and their branding guidelines get followed, but there's no way Twitter is going to be able to enforce their TOS on quoting something that someone else said just because it was said on their platform.