There's clearly questions about gamification, and whether a lot of these approaches are suitable and inducing unnecessary trading activity. Regulators are starting to look at what kind of behaviors can be induced through those apps." Treasury Secretary Janet Yellen has announced she will be meeting with the heads of the Securities and Exchange Commission, the Federal Reserve board, the New York Fed and the Commodities Futures Trading Commission, to discuss "whether recent activities are consistent with investor protection and fair and efficient markets."