Estimate the number of daily transactions or interactions generated by Threads

Problem Statement Description

Product context: Meta is a social technology company; its products include Facebook, Instagram, WhatsApp, Messenger, Threads, Quest, creator tools, and ads.

Meta wants to understand the scale of daily activity generated by Threads, with a particular focus on teen users and their social behaviors across posting, replying, liking, reposting, following, viewing, sharing, and messaging-adjacent interactions. Your task is to estimate the number of daily transactions or interactions generated by Threads, using a structured guesstimate approach.

Clarify what counts as a “transaction” or “interaction” in the context of a social product like Threads, then define the scope of your estimate. You may choose to estimate global Threads activity, teen-user activity, or teen-driven activity as a segment, but you should make your scope explicit and keep the unit consistent.

The estimate should be grounded in reasonable assumptions about the addressable population, Threads adoption, daily active usage, session frequency, content consumption, engagement rates, and creator or social graph effects. You are not expected to know exact internal Meta numbers, but your reasoning should be transparent and testable.

The experience should consider:

- The exact unit being estimated: total daily interactions, teen-user interactions, or interactions involving teens

- Population scope, such as global teens, market-specific teens, or Threads’ active user base

- Adoption assumptions, including awareness, install/account linkage, and regular usage

- Daily activity patterns, including DAU/MAU behavior, sessions per day, and actions per session

- Interaction types, such as impressions, likes, replies, reposts, follows, profile visits, and shares

- Differences between passive consumption and active engagement

- Sensitivity to key assumptions, especially adoption rate, DAU rate, and interactions per active user

- Sanity checks against comparable social platforms such as TikTok, YouTube, Snap, Discord, or Instagram-like behavior

Your goal is to produce a defensible estimate and clearly explain the logic, assumptions, ranges, and confidence level behind it. The interviewer is evaluating how you structure ambiguity, select reasonable drivers, pressure-test your numbers, and communicate trade-offs rather than whether you know the actual metric.