Popular Google algorithms

Popular Google Algorithms 21 01 Panda Duplicate , plagiarized , or thin content ; user - generated spam ; keyword stuffing . 02 Penguin enguin : Spammy or irrelevant links ; links with over - optimized anchor text . 03 Hummingbird Keyword stuffing ; low - quality content . 04 Mobile Lack of a mobile version of the page : poor mobile usability . 05 Brain rank Lack of query - specific relevance ; shallow content : poor UX . salmanalm.com