https://www.reuters.com/article/us-retail-trading-facebook/facebook-temporarily-shuts-stock-trading-group-after-gamestop-frenzy-idUSKBN29X34P >Facebook Inc took down a popular Wall Street discussion group, Robinhood Stock Traders, in a move its founder said was an unjustified response to conversations that have buoyed shares in GameStop Corp and other companies.