Reach data is strongest when you know what it can prove, what it cannot, and where momentum starts.
The useful research starts before a trend is obvious. In AfterLib, that means looking for creative age, reach movement, page activity, offer consistency, and the moments where several signals point in the same direction.
Use the post as a starting point for your own workflow: collect a handful of ads, compare the angle behind each one, and only test ideas that have enough evidence to justify the spend.