Site info: Browsers expose some site info, but it’s ridiculously limited. Here’s some site info that you could easily provide users: date domain first purchased, first crawl of URL by Google or archive.org, related Wikipedia article on organization (and please financially support Wikipedia if doing this), any IFCN or press certification. Journal impact factor. Date last updated. Even better: provide some subset of this info when hovering over links.
Likely original reporting source: For a news story that is being re-re-re-reported by a thousand clickbait artists, use network and content analysis to find what the likely original reporting source is and suggest people take a look at that.
Other suggestions: in-built reverse image lookups, OCR of image memes, related sites.