Keith Olbermann responded to his firing by Current TV in a wholly expected manner: by Twitter.
In a tweet to his 376,113 followers, the obstreperous news host apologized to his viewers and his staff for the "failure" of Current TV, and called his joining the network "a well-intentioned 
gesture on my part but in retrospect a foolish one."
Also read: Keith Olbermann Fired By Current TV
In his tweets, Olbermann threatened legal action against Current and its leaders Joel Hyatt and former Vice President Al Gore.
"In due course, the truth of the ethics of Mr. Gore and Mr. Hyatt will come out," Olbermann tweeted.
The network said it fully expected lawsuits will be filed in both directions.
Current TV fired Olbermann on Friday, saying that he did not represent the network's values of "respect, openness, collegiality, and loyalty to our viewers."
Also read: Is Keith Olbermann Feuding With Current TV?
In response, Olbermann dredged up a piece of history as evidence he had been unjustly ousted.
He tweeted a link to a New York Times article from 1990 that documented an AIDS discrimination case involving Hyatt's legal firm. In the case, a federal district judge ruled that Hyatt Legal Services had illegally removed the head of its Philadelphia office, Clarence B. Cain, after discovering he had AIDS.
"To understand Mr. Hyatt’s 'values of respect, openness, collegiality and loyalty,' I encourage you to read of a previous occasion Mr. Hyatt found himself in court for having unjustly fired an employee," Olbermann tweeted.
The controversial news host has been at the fledgling cable channel for less than a year.
Former New York Governor Eliot Spitzer will replace Olbermann starting Friday night in a new program called "Viewpoint with Eliot Spitzer," the network announced.
Beyond Olbermann's barrage of tweeting, Current had other Twitter headaches. The Twitter handle (@ESpitzer) the network included along with its announcement of Spitzer's new show is a fake and does not belong to the former governor.
Here are Olbermann's series of tweets:
"1/ I'd like to apologize to my viewers and my staff for the failure of Current TV. Editorially, Countdown had never been better," he tweeted in the first of what was presumably a series of responses to his firing by Current TV.
2/ But for more than a year I have been imploring
@AlGore and@JoelHyatt to resolve our issues internally
3/ while I've been not publicizing my complaints, and keeping the show alive for the sake of its loyal viewers and even more loyal staff.
4/ Nevertheless, Mr. Gore and Mr. Hyatt, instead of abiding by their promises and obligations and investing in a quality news program,
5/ finally thought it was more economical to try to get out of my contract. It goes almost without saying that the claims against me
6/ in Current's statement are untrue and will be proved so in the legal actions I will be filing against them presently….
10/ that joining them was a sincere and well-intentioned gesture on my part, but in retrospect a foolish one.
11/11 That lack of judgment is mine and mine alone, and I apologize again for it.