The difference is often difficult to discern, but here's a real-world example.
Arianna has booted contributer Dr. Peter Rost: "Setting the Record Straight: On Trolls, Moles, and Dis-Invited Bloggers":
Dear HuffPost Readers, Commenters, and Bloggers,
Here's the bottom line on the issues raised by Peter Rost: We disabled his password for one reason and one reason only -- his refusal to act as part of our online community.
A little background: Peter Rost was initially invited to post about issues related to the pharmaceutical industry, his area of expertise -- but his posts increasingly became about his personal grudges and beefs or long, self-referential, diary-like entries about finding an injured bird in his front yard (complete with photos) or a blog post about his friend having an extramarital affair...
(HuffAndBlow is, of course, a take-off on the HuffPost. The Duchovny character was invented before Rost began posting to HuffPost and - spoiler warning! - is a take-off on Air America co-founder, loony loose cannon, and HuffPost contributor Sheldon Drobny That's a picture of The Captain from Gilligan's Island next to his entries.)
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