[hengistbury]

Facebook might be a US tech company, but the US isn't their largest user base, that crown currently goes to India according to Statista: https://www.statista.com/statistics/268136/top-15-countries-...

[dewey]

The number of users matters much less for FB. The amount of users which can be monetized matters much more and the CPC for US users is always much higher than other countries.