Estimate how many emerging-market users could use Messenger weekly in one major market

Problem Statement Description

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

Estimate the number of people in one major emerging market who could use Meta Messenger on a weekly basis. This is a guesstimate exercise focused on sizing a realistic weekly active user opportunity for Messenger within a specific country context, rather than producing a precise reported metric.

You should pick or clearly define one major emerging market and frame the estimate around Messenger’s role in everyday communication: one-to-one chats, group conversations, business messaging, social graph connections, and cross-app Meta ecosystem usage. The estimate should account for local constraints such as smartphone access, mobile internet penetration, data affordability, language, urban-rural differences, competing messaging apps, and trust or safety considerations.

The focus is on building a structured, defensible sizing model. You are not expected to know exact internal Meta numbers, but you should make transparent assumptions, define the user population and time window, and show how changes in key assumptions would affect the final estimate.

The experience should consider:

- The chosen market scope, including whether the estimate covers the total population, internet users, smartphone users, or social media users

- The unit being estimated: weekly active Messenger users, not downloads, registered accounts, or monthly users

- Population filters such as age eligibility, mobile access, internet availability, and likely addressable audience

- Adoption drivers, including Meta social graph penetration, Facebook usage, business communication needs, and cross-app discovery

- Competitive and behavioral factors, including WhatsApp, Telegram, SMS, local chat apps, and default communication habits

- Frequency assumptions that distinguish occasional users from users likely to open or send messages weekly

- Sensitivity ranges for the largest assumptions, such as internet penetration, Messenger adoption rate, and weekly activity rate

- Sanity checks against comparable consumer internet, messaging, or social platform usage patterns in emerging markets

Your goal is to present a clear, logical estimate with explicit assumptions, a reasonable range, and an explanation of which assumptions matter most. The interviewer is looking for structured thinking, practical market understanding, and the ability to size a product opportunity under uncertainty.