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I don't think it would have a significant negative impact on Facebook at all

All I can tell you is that Facebook had a large audience before the pixel, and few advertisers were able to generate ROI from Facebook ads. Now he is suggesting that we will return to this state. Showing irrelevant ads to people based upon basic things - like being one of 150 million people that like Coke’s Facebook page - just flatly doesn’t work.

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But you're not stopping pixel. You're going to be tracked again. All you're doing is resetting the clock. How long after pixel was implemented did it take for the value of Facebook ads to skyrocket? A few years? And Facebook gets to keep all that they learned during that time, just not the original data they've derived all that wealth from. It's like losing training data for ML. It's not a big deal when you get 10s if not 100s of millions or more data points every day.

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