Pao was responding to a tweet by the Washington Post's Aram Zucker-Schariff, quoting the following segment of the article: 

The metrics are fake.

Take something as seemingly simple as how we measure web traffic. Metrics should be the most real thing on the internet: They are countable, trackable, and verifiable, and their existence undergirds the advertising business that drives our biggest social and search platforms. Yet not even Facebook, the world's greatest data–gathering organization, seems able to produce genuine figures. In October, small advertisers filed suit against the social-media giant, accusing it of covering up, for a year, its significant overstatements of the time users spent watching videos on the platform (by 60 to 80?percent, Facebook says; by 150 to 900 percent, the plaintiffs say). According to an exhaustive list at MarketingLand, over the past two years Facebook has admitted to misreporting the reach of posts on Facebook Pages (in two different ways), the rate at which viewers complete ad videos, the average time spent reading its "Instant Articles," the amount of referral traffic from Facebook to external websites, the number of views that videos received via Facebook's mobile site, and the number of video views in Instant Articles.