[onion2k]

Why does Yale insist that antitrust can apply when prices are 0?

"Consumers" on Facebook are ad buyers, not users. Prices aren't 0 - Facebook's revenue was $70bn in 2019. That comes from businesses buy ads. Everything Facebook does to dominate the social media space is about selling more ads for more money. That's why they buy competitors, shut down rivals, and aggressively do what they can to drive prices for the ads on their platforms up.

[btmoney06]

If we’re focusing on ad buyers instead of users, then why isn’t the relevant market just all “advertising companies” (instead of social media companies)? When you compare Facebook to other advertising companies, their market share dwindles. Google holds the advertising throne.

[onion2k]

Google's 2019 revenue was $162bn. They're only twice as big as FB by that metric, and they have far less than twice the market share.