How does Facebook calculate engagement rate?

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Tags

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2. #shares
3. #images
4. #clicks
5. #videos
6. #engagements
7. #total
8. #facebook
9. #whole
10. #reactions
11. #divided
12. #comments
13. #links
14. #multiply
15. #calculated
16. #users
17. #engagement
18. #number
19. #engaged
20. #reach
21. #percentage
22. #thing