I am curious what 'used' means. e.g. Does logging into a third party service via facebook login count as 'used' since you technically hit their servers?
My interpretation of that would be that if, prior to that change, you logged to spotify with facebook and didn't uncheck the 'share' button you would have been counted, but after you would not have been.
I do find it rather curious that they simply count any user that logs in and 'visited' facebook. i.e. that no 'actions' need to take place or there isn't any metric for time on site required. Seems rather easy to game that number by just not going after bot accounts.
But at the end of the day there's one number that matters: people click ads and buy products -> companies buy ads and pay fees. And it's been going up steadily for the past decade.
If you strongly believe that you've found an inefficiency in the market please feel free to short FB.
