https://www.cnbc.com/2018/05/01/facebooks-mark-zuckerberg-will-be-summoned-to-testify-next-time-hes-in-britain.html

UK officials said Tuesday they will summon Facebook CEO Mark Zuckerberg to testify before Parliament the next time he's in British territory if he does not volunteer to do so.

It would be the first governmental summons for Zuckerberg in the fallout of the Cambridge Analytica data leak and widespread concerns around user privacy.