The largest market at the moment for social/copy trading right is the Forex market. This is arguably because the foreign exchange market maintains the largest overall volume of any market at the moment. More liquidity means faster, more precise execution, so as a result the Forex market has been argued to be the best option for social & copy trading. Additionally, if you're thinking about it conceptually, the market with the most traders will have a higher chance for a profitable/high-return basis. As a result, the Forex market has been looked at as the best option for social trading.