Kim Kardashian’s Instagram Post on Cryptocurrency Prompts U.K. Financial Watchdog to React

An Instagram post by Kim Kardashian asking her Instagram followers to join “the Ethereum Max Community” is bringing social media’s role in promoting cryptocurrency into the spotlight.

Charles Randell, head of the U.K.’s Financial Conduct Authority, said Ms. Kardashian’s post might “have been the financial promotion with the single biggest audience reach in history.”