> The data source for this post is eToro, a brokerage company that offers a feature called Social Trading, which is social network for traders. It is enabled by

> The data source for this post is eToro, a brokerage company that offers a feature called Social Trading, which is social network for traders. It is enabled by default and allows users to view and copy other users’ trades. Therefore, everyone’s trading performance is publicly available who have not disabled Social Trading. What if the winners are choosing not to make their trades public? That alone could introduce some serious bias.