“In what many will see as the latest sign of investor euphoria — and of our society’s oversharing epidemic — sharing your 401(k) balance on social media seems to have become a thing. With the Dow Jones Industrial Average and the S&P 500 index hitting record after record since President Trump’s election in November 2016, the question, ‘How’s your 401(k) doing?’ has become a staple in his speeches at campaign-style rallies and fundraisers. And 401(k) balance shoutouts have become a staple among his supporters — and detractors — on Twitter.”