How keystonejs.com Looks on Facebook
keystonejs.com has the basics in place, with a handful of fixes that would tighten things up. Open Graph, Twitter Card, and a favicon are all wired up. The previews below show exactly how a link to keystonejs.com looks on Facebook.
Facebook preview
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keystonejs.com
KeystoneJS: The superpowered Node.js Headless CMS for developers
Build faster and scale further with the programmable open source GraphQL API back-end for structured content projects.
Compact card (image < 600px wide)

keystonejs.com
KeystoneJS: The superpowered Node.js Headless CMS ...
Build faster and scale further with the programmable open source GraphQL API bac...
Analysis
The biggest fix on Facebook: Mixed content: HTTPS page with HTTP image. Beyond that, there is one more issue flagged below.
What's working: social share image found, plus 2 other checks passing.
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