The popular kids always end up the most successful adults … er, right?

There are a few exchange-traded funds that invest according to the wisdom of the crowd. One such product, the SoFi Social 50 ETF (SFYF), holds the most popular stocks among SoFi customers. And that firm is extending the strategy to a new fund with a high-income flavor. 

There are some similarities with momentum funds, which means there’s a lot that can go right or wrong: They are more volatile than the broader markets. “A lot of sentiment is going to be based on what’s doing well and what’s not doing well,” said Daniel Sotiroff, senior manager research analyst at Morningstar. “Momentum has risks and rewards with it. It works really well in…