The Observer’s main revelation over the last couple of weeks has been their claim that Cambridge Analytica harvested data from 50 million Facebook accounts. They found that CA’s Aleksander Kogan collected data from 270,000 accounts and was able to access data from all their friends – on average 185 users per account – making up a total of 50 million. This does seem to add up, the most recent figures suggest the median number of Facebook friends per account is just under 200.

The Guardian app’s privacy policy reveals they also collect data from your Facebook account, and the accounts of all your friends. This data includes “your name, profile picture, gender, networks, user ID and any other information you choose to share according to your Facebook account settings, as well as the user details of your Facebook friends”. You have to give permission to have your data, and that of your friends, collected if you want to use the app. This has been happening for years…

The Guardian say their app has 3.2 million active users. If those users have on average 185 Facebook friends each, that means the Guardian has potentially accessed the personal Facebook data of something like 592 million accounts. That is more than ten times the number Cambridge Analytica reportedly got hold of. This is a conservative estimate as it only includes “active” users of the Guardian app – it will have been downloaded by many more down the years. Will Damian Collins be hauling the head of data and CEO of the Guardian in front of his select committee?