After adding colored backgrounds on status updates back in December (which are being rolled out to all users at present), color enhanced versions of link previews have now been spotted in some versions of Facebook's iOS app and mobile web versions of the social network.
As you can see from the above examples, the new look previews drop a colored overlay under the headline of the article with a new headline font.
The color of each background is dynamic, reflecting the dominant color from the featured image, or a complimentary color for those images which are largely white space.
Psychologically, color is a trigger.
It's designed to create a connection with brand, elicit a feeling, or drive a response.
This is something marketers have been aware of for years, and is a critical consideration when exploring branding options for many of the world’s biggest businesses.