Product & Growth · Product Strategy · Medium · 25-35 min

Social Platform — Reversing Declining Engagement

Social Platform — Reversing Declining Engagement is a medium Product & Growth product strategy case interview that runs 25-35 min. A social platform's daily active users are flat but time-spent and content-creation are declining, especially among younger users who are drifting to a short-video competitor. A strong answer works through 5 phases: Diagnose the real problem; Segment by cohort; Evaluate the short-video bet vs other levers (creator incentives, ranking changes); Consider the risk of a fast-follow feature; Recommend a response tied to the diagnosed cause, with a way to measure success.

Last updated 2026-09-05

The brief

A social platform's daily active users are flat but time-spent and content-creation are declining, especially among younger users who are drifting to a short-video competitor. The product team wants to ship a short-video feature; leadership wants to know whether that's the right response and what's really driving the decline. You advise.

How to approach it

  1. Diagnose the real problem — is it format (short video), creator supply, algorithm, or demographic shift
  2. Segment by cohort — where the decline concentrates (younger users) and why
  3. Evaluate the short-video bet vs other levers (creator incentives, ranking changes)
  4. Consider the risk of a fast-follow feature — late, undifferentiated, cannibalizing core
  5. Recommend a response tied to the diagnosed cause, with a way to measure success

What a strong answer does

  • Diagnoses the driver before prescribing the short-video feature
  • Segments by cohort to locate the decline rather than treating users as one block
  • Weighs whether a me-too feature can win against an entrenched competitor
  • Considers the creator/supply side, not just consumption
  • Defines the engagement metric that proves the fix works

Red flags interviewers score down

  • Ships short video because the competitor has it, with no diagnosis
  • Treats all users as one segment and misses the youth-specific drift
  • Ignores the creator/content-supply side of engagement
  • No success metric for whether the intervention worked

Cases are written in each firm's style, written and reviewed by working consultants; they are not the firms' own published cases.

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