https://www.cnet.com/news/eu-parliament-to-grill-facebooks-zuckerberg-over-data-mining-election-meddling-cambridge-analytica-congress/ > Yes, it's as serious as all that. > The 34-year-old multibillionaire is set to testify before the European Union's Parliament on Tuesday. Lawmakers will discuss everything from Russian meddling in the 2016 US presidential election, which some argue handed a victory to Donald Trump, to the 87 million user profiles that were mistakenly shared with a now-defunct UK-based political consultancy called Cambridge Analytica.