Let's say that Facebook would like to change the user interface of the composer feature (the posting box) to be more like Instagram. Instead of a box, Facebook would add a + button at the bottom of the page. How would you test if this is a good idea?

Introduction

To approach this user interface change problem effectively, I will follow a simple product success metric framework. I'll cover core metrics, supporting indicators, and risk factors while considering all key stakeholders. This structured approach will help us evaluate whether changing Facebook's composer feature to resemble Instagram's interface is a good idea.

Step 1

Product Context

The composer feature is a critical component of Facebook's core functionality, allowing users to create and share content. The proposed change involves replacing the current posting box with a "+" button at the bottom of the page, similar to Instagram's interface.

Key stakeholders include:

1. Users: Seeking an intuitive and efficient way to share content
2. Facebook: Aiming to increase user engagement and content creation
3. Advertisers: Interested in more user-generated content for ad placement

User flow:

1. User identifies the need to create content
2. User locates and activates the composer feature
3. User creates and reviews content
4. User publishes the content to their network

This change aligns with Facebook's strategy to create a more streamlined, mobile-first experience. It also reflects the company's efforts to harmonize its family of apps.

Competitors like Twitter and LinkedIn have maintained more traditional composer interfaces, making this a potential differentiator for Facebook.

Product Lifecycle Stage: Mature. The composer is a well-established feature, but Facebook is seeking to innovate and improve user experience.