Social trading allows traders to observe the trading behavior of expert traders and copy their trades. Social trading networks have their own methods to examine, test and validate the trading results of strategies they upload to their platform. On social trading platforms the real challenge for you as a trader is to choose a set of well diversified, uncorrelated strategies that can be profitable.
The main drawback is that the robustness of the strategies cannot be verified since good results may be seen only under certain market conditions. Also the historical performance metrics of the strategy is only based on relatively shorter duration like one or two years which makes setting trade expectations and risk levels difficult. It is also impossible to predict good traders solely based on recent past performance.