Grokking the System Design Interview
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Designing Facebook Messenger
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1. What is Facebook Messenger?

Facebook Messenger is a software application that provides text-based instant messaging services to its users. Messenger users can chat with their Facebook friends both from cell phones and Facebook’s website.

Try it yourself

Before looking at the solution, try designing it:

Designing Messenger (video)

Here is a video discussing how to design Facebook Messenger:

2. Requirements and Goals of the System

Our Messenger should meet the following requirements:

Functional Requirements:

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