本期内容：

The US Federal Trade Commission is reported to be investigating Facebook after allegations that 50 million users' private information was misused by a political consultancy firm. Cambridge Analytica (CA), hired by the Trump campaign in the 2016 US election, has been accused of taking the personal data unknown to users. Facebook's stock has continued to slide, following a steep decline on Monday. Mr Zuckerberg did not attend a Facebook staff briefing on the crisis at its Californian headquarters on Tuesday, which was led by deputy general counsel Paul Grewal instead, the Daily Beast news site reports.

allegation: 指控
consultancy firm: 咨询公司
be accused of: 被指控做某事
stock：股票
slide：滑行；下跌
steep：陡峭的，猛烈的
briefing：短会，简会
headquarter：总部

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