Comment by mrkramer

I actually think the good old Page rank[0] is crucial because if the authoritative sources link to some website, webpage or content it means that particular item provides some kind of value to the entity that linked it. I'm also a big fan of metadata which can be used to describe web content and make the content more usable to the search engines and the Web users.

[0]https://en.wikipedia.org/wiki/PageRank