Hey - Reddit is included as a source because posts can contain firsthand accounts and independent analysis. The RSS feed we use from Reddit provides the post title and text. So to answer your question, when you see Reddit as a source we are using the aforementioned data, not what it links to.

About "common knowledge" sources - we validate all content for accuracy. When the LLM needs to add context that's missing from sources (e.g. historical background), we mark these as "common knowledge" since this generated content can't be validated against the original sources. You're right that your example isn't common knowledge at all, we'll work on adding actual sources for these claims too.

Thanks for trying it out!