How Facebook Cover Images Appear Quickly on Mobile Devices

How does Facebook ensure that its mobile users see cover images, and not gray boxes, especially in developing countries where 2G connections are common?

How does Facebook ensure that its mobile users see cover images, and not gray boxes, especially in developing countries where 2G connections are common?

Director of engineering Brian Cabral and engineer Edward Kandrot used a post on Facebook’s engineering blog to describe the process of taking cover photos that can run as large as 100 kilobytes and displaying them as mere 200-byte images.

Cabral and Kandrot explained why the social network’s engineering team undertook this project:

We initially focused on the cover photo, the beautiful, high-resolution picture at the top of profiles and pages.

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