This is part of the network of personal data connecting apps.
If you want to get even a sense of what these power and profit-hungry companies are doing, watch "The Great Hack". It is on Netflix and shows how Facebook, Cambridge Analytica and its new faces, like Lithium, are gathering up to 5000 points of personal data on each of us. The purpose? Yes, to sell you things and grab your attention with personally focused ads and 'information'. .. and to persuade you how to vote, think, run your increasingly managed life!!!! Get off as many apps as you can. Get off Facebook if you can.