MassMutual subsidiary MML Investors Services will pay a $4 million fine to the state of Massachusetts, with Commonwealth Secretary William Galvin's office arguing that the firm poorly supervised social media usage by its agents, including Keith Gill, a former registered rep whose social media postings became a central point in the GameStop saga. Gill is famously known for his Reddit moniker "DeepFValue" and "Roaring Kitty" on YouTube. The consent orders were signed this week, with Galvin saying MassMutual had agreed to "undergo an independent compliance review" of its social media policies and trading practices for broker/dealer agents, and will also be under a compliance audit lasting three years. According to Galvin, the firm's poor social media supervision continuously failed to pick up on Gill's identity.