Facebook ran over 45 ads variations just in the month of September, 2019.
All targeting various interest groups.
FB is a $22B company. They grew 8% in monthly users this year. Everything they do has a strategy associated with it. Nope, they're not going to disappear in 2022 or be usurped by Google or someone else. Paid cable television (is declining right now, according to Forbes) will disappear before Facebook™ will.
Can you afford to run campaigns supporting 45 ads variations? 90%+ of companies can. Most don't. Surprised? Shocked?
That's how to do FB marketing.
What are you doing?
What's your next step?