Ask yourself one question while looking at the white paper: Why on earth should that token hold any worth? Most of the time, there is no answer meaning the token is essentially worthless (because they are not securities).
Sometimes there will be a credible value proposition. This is where you should invest.

People here a too focused on social media and tech. F*** that. For example, XRP has great tech and even if all the banks in the world adopted this tech, the token would never be worth much. Why? Because they won't use it. And with the XRP token you don't own a share in the tech or company.