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There's nothing random about Facebook advertising sales. Regardless of how your feed is customized, they know exactly who you are and what you're interested in.

"...because it's harder to sell random reach to advertisers. Remember that you're not Facebook's customer, so this is a move to keep eyeballs from leaving."

Exactly.

Random reach? Consistent UX?

The UX is the same, just the content is different (just as it is today, I don't get the same feed as you).