Will the number of monthly active users on Facebook decline between any two quarters by the end of 2024? It does not have to decline to lower than the current value, just lower than the previous quarter. So far, this has only happened once, between Q1 to Q2 of 2022, where the MAU decreased by 2 million (out of almost 3 billion). But Facebook's growth has been leveling off, so another decline may happen sooner rather than later.

See also: /JosephNoonan/will-facebooks-monthly-active-users

https://www.statista.com/statistics/264810/number-of-monthly-active-facebook-users-worldwide/

Facebook MAU worldwide 2023 | Statista

The company reported over 2.9 billion monthly active users in Q1 2022, making Facebook the largest social network worldwide.