Facebook reported $86 billion in revenue for fiscal year 2020, up 22% from the $70.7 billion they reported in 2019. After paying $53.3 billion in expenses and provisioning $4 billion for income taxes, Facebook’s net income for 2020 comes out to $29.1 billion.
Nearly all of that money came from advertising: in total, advertising comprised $84.2 billion, or 98%, of Facebook’s $86 billion total revenue. Facebook does not break down its revenue in greater detail than that, so it’s hard to say for sure how much money came from Facebook and how much came from other sources, such as Instagram and WhatsApp.
You can read more in Facebook’s full earnings report for Q4 2020.