Small toy figures are seen in front of Facebook logo in this illustration picture, April 8, 2019. REUTERS/Dado Ruvic/Illustration

(Reuters) - Facebook Inc FB.O agreed to pay a $100 million fine to settle charges by the U.S. Securities and Exchange Commission that it misled investors for more than two years about the misuse of its users' data, the regulator said on Wednesday.

The SEC said Facebook knew by Dec. 2015 that a researcher had improperly sold information related to tens of millions of users to data analytics firm Cambridge Analytica, but did not disclose the breach until March 2018, causing its stock to drop.

Facebook did not admit or deny wrongdoing in agreeing to settle.