Based on our record, Facebook Design Resources should be more popular than Module. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Spotify isn't doing anything unique here, and it's not really a marketing campaign to explain away their UI. It's more of a showcase for hiring professionals, developers/designers/etc. Facebook has a similar one -> https://design.facebook.com/. Source: almost 3 years ago
Also, read anything published by Design @ Facebook. Source: about 3 years ago
Module, a sleek Figma UI kit and design system, offers a streamlined approach to UI creation. Leveraging Figma's Auto Layout features, it presents a cohesive package including color styles, icons, responsive components, and a uniform spacing system, all aligned to a 4px baseline grid. - Source: dev.to / 10 months ago
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