See two examples of how we categorize content for the predictive content recommendations that will only show the categorized content in the rich media output.
See full documentation here to set up and implement the Rich Media Recommendations and Categories: Enabling Rich Media Recommendation Engine
What is a Category?
Use a Content Category to group content for a specific rich media recommendation template. Leaving the category empty applies the content to all recommendation templates (recommended). However, if you want to recommend only specific content for a Rich Media template, add a category for the content and associate that category with the recommendation template.
Example: Categorizing relevant content according to sections of your website (products or solutions).
Hatch Early Learning
Hatch Early Learning only show Webinar related predictive content on their thank you page after webinar registration.
On Marketo.com, we also categorize predictive content based on the different solutions we offer.
For Customer Marketing, see the Rich Media recommendations at the bottom of the page: https://www.marketo.com/solutions/customer-marketing/
So, those are two examples of how customers and Marketo are using the categorize content feature for displaying Predictive Content.