The investigation of Facebook announced in September had included Colorado, Florida, Iowa, Nebraska, North Carolina, Ohio, Tennessee and the District of Columbia. It now includes most U.S. states as well as the U.S. territory of Guam.
Facebook shares were down more than 2% at $184.73 on Tuesday. The company had no immediate comment.
The statement provided a list of states involved in the probe and added that other states “cannot confirm their participation in pending investigations.” California, the largest state, was not on the list.
Some states, particularly New York and Nebraska, have raised concerns that Facebook and other big tech companies engage in anti-competitive practices, expose consumer data to potential data theft and push up advertising prices.
Facebook also faces probes by the U.S. Justice Department and the Federal Trade Commission, as well as the House of Representatives Judiciary Committee.
The Facebook investigations are part of a larger landscape of probes of big tech firms.
Reuters and others reported in June that the Justice Department and FTC had divided responsibility for the companies being investigated, with the Justice Department taking on Alphabet Inc’s Google and Apple Inc while the FTC looked into Facebook and Amazon.com Inc. The Justice Department later said it was opening a probe of online platforms, which would include Facebook.
