From a reasonable sized set of people I know who use Facebook Pages they saw a massive downward trend in engagement from people who liked the page at the same t

From a reasonable sized set of people I know who use Facebook Pages they saw a massive downward trend in engagement from people who liked the page at the same time Promoted Posts came in. Complete conjecture as I know a statistically small set of people in comparison to the number of people using Pages, but 30 people with the same issue is a bit of an odd situation.