The Maropost Web Spider only catalogs pages that include the 'keywords' HTML meta tag. For each of these pages, the spider will also catalog the URL of the page, its title, and its description (if the 'description' HTML meta tag is included)
Assuming your website also uses additional types of HTML meta tags (e.g. OpenGraph tags) then you can specify those same tags for Recommendation Rules, and for inclusion in the personalized content recommendation email.
To create a new Custom Tag for content recommendations, select 'Web' from the main menu on the home screen. Once in the Web module, select Web Tracking to display the web sites index page. Click on the name of the web site that you have implemented web tracking. Then select New Custom Tag located in the top-right corner of your screen. Now, you will see the screen below:

- Name – Enter the name of your HTML meta tag. Examples include “og:title”, “og:image”, “twitter:card”, and others.
- Product SKU (optional) – Checking this box informs the Recommendation Engine that this meta tag’s value is the product SKU that matches the 'Item ID' in the Product/Revenue database. This setting enables the Recommendation Engine to recommend content on your site based on your contacts’ own purchase history.
- Tag type – Maropost supports string, numeric, date/time, and boolean data types.
- Default value – Enter the default value for the custom tag in case a particular page doesn’t include that custom tag.
Once you save your custom HTML meta tag, the next time the Maropost web spider crawls your site, it will store that tag and its value with the page URLs containing that tag. It will then appear as a filter option and as a feed tag option in Recommendation Rules.