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Yesterdays XKCD (https://xkcd.com/2006/) brings light to what you're selling when you sign up for a store loyalty program, "like" a store on facebook, or "check-in".
I get it - the lure of almost free money is a siren song.
But when doing the like/check-in thing - setup a sock puppet account which is only used for these things.
When signing up for a loyalty card or the like - lie or omit as much as you can!