Seems Facebook has partnered with Datalogic to link your Facebook activities to your real world purchases. The idea is to see whether you purchase things you see in Facebook ads, so they can sell more advertising space. You may or may not be comfortable with that; the article tells you how to opt out. For now, at least. The main reason I deleted my Facebook account was because they kept resetting all my privacy preferences every time they had an update.
Facebook Links to Real World Shopping
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