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I’ve written about this point exactly. This is not only what puts or data at risk, but also is responsible for the short of the entire internet as a large advertising machine. You can read my thoughts here if you’d like: “How Web 2.0 turned into a manipulative ad-monster” @sukienniko https://hackernoon.com/how-web-2-0-turned-into-a-manipulative-ad-monster-bab6dc09b9d4