Algorithm Updates
Google MUM Explained: What It Does (and Doesn't Do) in Search
MUM was billed as 1,000 times more powerful than BERT, yet Google says it isn't used for general ranking. Here is what it actually does in Search.
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Algorithm Updates
Core Updates vs Spam Updates vs System Updates: Key Differences
How Google's core, spam and system updates differ in purpose, scope and recovery, with dated examples from the Search Status Dashboard.
Algorithm Updates
Google's Ranking Systems Guide Explained, System by System
A plain-English walk through every system in Google's ranking systems guide and the updates behind each one.
Algorithm Updates
Google's Retired Ranking Systems: Panda, Penguin, Hummingbird and Helpful Content
What “retired” means in Google's ranking systems guide, and the dates and legacy of Panda, Penguin, Hummingbird and helpful content.
Algorithm Updates
Google's Site Diversity System: Why One Site Rarely Gets More Than Two Results
Why one site rarely gets more than two main listings in Google, how subdomains count, and what to do about it.
Algorithm Updates
Google's Reliable Information Systems and Content Advisories
How Google surfaces authoritative sources, demotes low-quality content and shows content advisories on fast-changing topics.
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