Facebook's payola works much the same: when you publish a post on Facebook, you have to pay to boost it if you want it to reach the people who follow you - that is, the people who signed up to see what you post. Facebook may claim that it does this to keep its users' feeds "uncluttered" but that's a very thin pretense. Though you follow friends and family on Facebook, your feed is weighted to accounts willing to cough up the payola to reach you.
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The "uncluttering" excuse wears even thinner when you realize that there's no way to tell a platform: "This isn't clutter, show it to me *every* time." Think of how the cartel of giant email providers uses the excuse of spam to block mailing lists and newsletters that their users have *explicitly* signed up for.
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