Much about Russia’s online efforts to roil the 2016 US election remains murky. But as executives from America’s top social-media companies — or more precisely, their lawyers — testified before Congress this week, two things became clear. First, the problem is much greater than previously admitted. And second, the companies in question have little incentive to solve it. In two ...

Congress adopted a budget last week, paving the way for the introduction of a tax bill, and the White House responded (as it is wont to do) with a tweet. “Budget passes house,” it read. “Momentum for tax cuts growing. #TaxCuts #TaxReform.” Sadly, this message betrays a confusion that does not bode well for the prospects for smart tax reform. ...

Catalonia’s now ousted separatist leader Carles Puigdemont has to look for hopeful signs wherever he can get them. After Girona FC, his hometown soccer team, sensationally defeated Real Madrid 2-1 on Sunday, Puigdemont tweeted it was ‘an example and a reference for many situations’ — and added a winking emoticon. In reality, the weekend’s events showed Puigdemont and other Catalan ...