Facebook CEO Mark Zuckerberg has again turned down an invitation from UK and Canadian lawmakers to appear in London to politely discuss disinformation and fake news on the social media site. Instead of sending Mr. Zuckerberg to be questioned about Cambridge Analytica and other issues, Facebook announced via a letter that they are sending senior executives from the company to the meeting. This did not sit well with the lawmakers as more countries joined the call for Zuckerberg to appear. "We are very disappointed by this dismissive response," the signatories wrote. Zuckerberg should give the 170 million collective users in these countries "the same line of accountability" that they gave users in the U.S. and European Union by showing up to confront lawmakers directly, they said, restating their request for the chief executive to attend the hearing.