https://www.schneier.com/crypto-gram/archives/2017/0915.html#1
Key points from article
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In case you didn’t notice, you’re not Equifax’s customer. You’re its product.
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It collects information about all of us, analyzes it all, and then sells those insights.
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You’re secretly tracked on pretty much every commercial website you visit.
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Facebook is the largest surveillance organization mankind has created; collecting data on you is its business model. I don’t have a Facebook account, but Facebook still keeps a surprisingly complete dossier on me and my associations – just in case I ever decide to join.
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I also don’t have a Gmail account, because I don’t want Google storing my e-mail. But my guess is that it has about half of my e-mail anyway, because so many people I correspond with have accounts.
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And again, many companies that track us do so in secret, without our knowledge and consent.