Shares of Facebook (FB - Get Report)  were falling Tuesday after it was revealed that 47 different state attorneys generals have now signed on to an antitrust probe that was first announced in September. 

The attorneys general of Colorado, Florida, Iowa, Nebraska, North Carolina, Ohio, Tennessee and the District of Columbia have joined New York Attorney General Letitia James on the leadership team investigating the company. 

"After continued bipartisan conversations with attorneys general from around the country, today I am announcing that we have vastly expanded the list of states, districts, and territories investigating Facebook for potential antitrust violations," James said in a statement Tuesday. 

The group claims that Facebook has put consumer data at risk while reducing the quality of consumers' choices and increasing the price our advertising. It said that "we will use every investigative tool at our disposal to determine whether Facebook's actions stifled competition and put users at risk."

Facebook shares were down 2.8% to $184.52 on Tuesday. Shares are up about 40% year to date.

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