Facebook's iOS Bug Led ComScore to Overestimate Time Spent

Zuckerberg must be learning from Volkswagen. I love to see cross-industry collaboration.

"asked digital measurement firm ComScore -- which uses calls made by Facebook's apps as a proxy for time spent"

How does ComScore go about measuring this? Do they run background processes on devices that can detect network calls by other applications? Do they detect the traffic elsewhere in the network? Both of those seem unlikely, so I'm confused.

Facebook used this number and mentioned on it during the earnings call, showing how their business is growing and people are spending more and more time using their app and website. Does this have any implications (if they knew the bug was already there) that they publish wrong and inaccurate information to mislead investors.

"bug"

Aren't there measurement rules that are meant to be followed to allow differentiation between active and passive calls?

I could see smaller apps not correctly following rules if they exist, however you'd hope that someone like ComScore would be making sure the top of their data is accurate.