One of the more annoying things on the internet is when people make stuff up and report it as news because it's possible that it could happen.
Fight News Unlimited received information from a reliable source recently pointing to a possible Carlos Mencia-esque rift between Rogan and UFC President Dana White. No, Dana White's not stealing Rogan's jokes, but rumor has it that White recently mandated that there be absolutely no mention of Randy Couture's name in any future UFC broadcasts. Rogan has been outspoken about Couture and the impact of Captain America's departure on the UFC and the sport of MMA.
This kind of thing really hits the yellow journalism standard on all cylinders. Make something up out of thin air, and explain it in a way that fits into a group of people's views on things (Dana is a controlling freak, etc).
Joe Rogan posted today at The Underground that the rumors are "bullshit," and went into more detail on his blog:
I'm certainly not upset at the UFC, and I'm not quitting to start doing commentary for a rival organization. I've also heard some ridiculous shit about me having massive fallout with the UFC president Dana White, which couldn't be further from the truth. Dana is a very good friend of mine, and in the 7 years I've known him we've never even had a single disagreement.
This speaks for itself, but people should be really careful about believing unsourced bullshit from people with a pre-existing bias.