At the end of June, Mark Zuckerberg announced that Facebook had hit a new level: two billion monthly active users. That number, the company’s preferred ‘metric’ when measuring its own size, means two billion different people used Facebook in the preceding month.
https://www.lrb.co.uk/the-paper/v39/n16/john-lanchester/you-are-the-product
https://www.lrb.co.uk/the-paper/v39/n16/john-lanchester/you-are-the-product