What I find scary is that I have multiple Facebook accounts (none of which I post to, but that’s a story for another day), set up with different email addresses from different domains, and yet I constantly get “do you know” suggestions for someone who would be appropriate for (or even already friended on) Facebook A to Facebook B and C. In each case, the account is very specific in terms of interests, likes, and friends. There is no crossover. The only explanation I can think of is that they’re using IP addresses as their basis.
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