The recent fast-spreading cryptocurrency scam involving the Twitter accounts of major companies and individuals, including former President Barack Obama, Joe Biden, Elon Musk, Bill Gates and Apple, is "small potatoes compared with the much worse things a malefactor could do with access to Twitter's highest profile accounts," such as President Donald Trump's, writes Ina Fried. Twitter attributed the breach to a "coordinated social engineering attack" on its own employees that enabled the hackers to access "internal systems and tools." If there was ever a reason to chat with your kids about vetting online posts, this is a good one.