Metrics question

What would you do if Facebook Stories engagement increased but Newsfeed engagement decreased?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Ability to reason about whether a metric shift represents cannibalization or genuine net loss, and respond appropriately.

First determine if this is cannibalization: are the same users simply spending time in Stories that they used to spend in Newsfeed.
Check total time spent across both surfaces combined, since a shift within the app may be neutral or even positive overall.
Segment by user type: if Stories mainly pulls from heavy Newsfeed users, the net effect on total engagement may be near zero.
If it is genuine cannibalization with no net gain, assess whether Stories has better long term value, such as higher ad load tolerance.
If Newsfeed engagement loss extends beyond Stories users, investigate a separate root cause for Newsfeed specifically.
Recommend a course of action, either accepting the shift if net positive, or investigating Newsfeed specifically if not.

Correctly frames the core question as cannibalization versus net change, rather than treating the Newsfeed drop as automatically bad.
Proposes checking total time spent across both surfaces, the right way to test for pure cannibalization.
Gives an illustrative number, e.g. assumes total time spent is flat, suggesting a shift rather than a loss.
Considers business value differences between surfaces, since Stories' ad format may monetize differently than Newsfeed.

Treating the Newsfeed drop as automatically a problem without checking for cannibalization first.
Not proposing any way to test whether this is the same users shifting behavior versus a real net loss.
Ignoring that different surfaces may have different monetization value, changing whether this even matters.

Chapters of the AI PM course that teach what this question tests.