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This article doesn't make anything clear - though it attempts to make the suggestion that the different social networks are communicating information about your

This article doesn't make anything clear - though it attempts to make the suggestion that the different social networks are communicating information about your activities across networks. In reality it seems as tho many of these social networks are actually just using very similar inputs to their people suggestion algorithms (on Facebook to suggest people you might want to be friends with, on dating networks to suggest people you might want to date). Since many of these suggestions are made to you based on your phone number or device location, you are likely to see the same people suggested to you by these different networks even tho they are not sharing data about your activities.

bhrgunatha 11y ago
> Facebook goes through your phone book and checks them against other users' phone numbers - you give it permission to do this when you install the app. > "What Facebook does and what Tinder does is go through your phone book, upload your phone book and does cross-correlation between your numbers and anyone else's number - and suggest people based on that," he explained. That seems pretty clear. They grab your WHOLE address book, so there is an established link stored in their database(s) between you and every other person stored on your phone. From there, it's just a matter of graph traversal. This is one of the reasons I decided I would stick with a dumb phone and why the mobile web (or using the web from phone or tablet) is so ripe for abuse.