FOX News has suspended an employee, dubbed "the Fox mole" by media site Gawker, after he anonymously posted behind-the-scenes videos and comments about the television network.
Joe Muto, who had worked as an associate producer on commentator Bill O'Reilly's show at Fox, began his postings on social media websites on Tuesday, and Gawker then began publishing "instalments" from the "mole" on its website.
After being suspended, Mr Muto posted a picture of himself late on Wednesday afternoon inside Gawker's office saying "It's Me, Joe: The Fox Mole."
"They nailed me," Mr Muto wrote on the Gawker website. "In the end, it was the digital trail that gave me away. ... They couldn't prove it entirely, but I was pretty much the only suspect."
By Wednesday, the posts became widely discussed on social media and in newsrooms across the United States because they purported to give a glimpse inside the news channel known for conservative personalities such as O'Reilly and Sean Hannity.
Mr Muto's posts included a video of Republican presidential candidate Mitt Romney's off-air banter in an interview with Hannity in which the politician was caught on camera using the word "dressage" about horses.
"I think Mitt loses points with the GOP base for his correct pronunciation of dressage," Mr Muto posted.
Another post railed about a gap in the bathroom stalls, with photo included, at Fox headquarters in New York.
On Wednesday afternoon, a Fox representative told website Mediaite.com that the TV network had identified the person and was exploring its legal options, but Mr Muto taunted Fox with another post saying, "I Am the Fox Mole, And I'm Still Here."
That changed late on Wednesday, Mr Muto said, when he was ushered into a Fox attorney's office and "suspended indefinitely ... with pay, oddly enough."
"I denied it, which is why they didn't fire me outright," Mr Muto wrote on Gawker about being the "mole." "But two nice gentlemen from security escorted me to my desk to pack up my stuff, and it was pretty obvious at that point that I would not be setting foot back into" Fox's New York headquarters.
Fox News is a unit of media giant News Corp.