Instead of the default system setting which brings in all the articles a given source produces, whitelist filters allow you to only bring in articles from a source if they meet certain topical requirements. If you add whitelist tags to a given source - for example red, orange and yellow - an article’s headline, description or AI-determined concepts need to have one of those colors in it, in order for the article to make it into your content pool, or Posts page. As another example, if rasa.io would like to pull in articles from CNN but only those associated with AI technology and newsletters then they would create whitelist tags about AI technology and newsletters i.e. AI technology, artificial intelligence, newsletter, machine learning, natural language processing, etc. If you want to be even more restrictive with the content coming in from a given source, simply increase your “# whitelist marches” higher than 1. The higher the number, the more terms an article needs to match on to come into your content pool. Whitelist tags can also be created as groups that can be toggled on and off.