Sam Thielman: Redditors took on hedge funds over GameStop and AMC Theatres stock and won. So what now?

``It's somewhat questionable whether what the Redditors did is strictly legal, and Nasdaq has already vowed to halt trading on any stock linked to what it is terming unusual social media activity. On one hand, unlike what Melvin (and many other hedge funds) do, what the Redditors did was all done out in the open. On the other hand, if people who worked for an investment firm stated their intent to change the price of publicly traded stocks by buying them in specific ways, they would probably have gotten into trouble with financial regulators.''