Keith Olberman Keith Olberman

Keith Olbermann made his opinion of Fox News and Bill O'Reilly known publicly on Twitter, calling the network "100% bullsh--" and saying O'Reilly is full of hate and lies.

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The MSNBC anchor responded to multiple Twitter users, several times saying Fox News is all "bullsh--" and adding that O'Reilly Factor provides "no news or facts. Just fears and delusions."

When a user tried to take a stab at Olbermann by saying "Face it, you R NEVER going to beat O'Reilly in the ratings. You obviously don't have it in you," Olbermann replied with, "you're right: I don't have as much hate or as many lies in me as O'Reilly."

Olbermann even went on a tirade about Rush Limbaugh, saying the popular conservative "Is 100% Pigeonsh--" and that "Rush is obsessed with 'Bending over' and the word 'anal.'"

It appeared as thought Olbermann had fun entertaining the tweets, saying, "I enjoy responding to the thin-brained."