Just read the linked article. Yes it might be number 1. But having looked at tweetknots, I'm surprised that twitter haven't thrown the book at them considering that their site is pretty much IDENTICAL to twitter. That really is quite shocking. There's using their logo or similar colours (to show that the site is something to do with twitter) and there's stealing the whole layout (which is what tweetknot seems to have done).
Not to justify anything but I really don't think they have any qualifications for any type of graphical design, look at their logo its as if someone went into mspaint with a mouse.
I think tweetknot got off lightly.