Below Check All Major and Minor SEO Updates in 2015
RankBrain* — October 26, 2015
Google made a major announcement, revealing that machine learning had been a part of the algorithm for months, contributing to the 3rd most influential ranking factor. *Note: This is an announcement date - we believe the actual launch was closer to spring 2015.
Panda 4.2 (#28) — July 17, 2015
Google announced what was most likely a Panda data refresh, saying that it could take months to fully roll out. The immediate impact was unclear, and there were no clear signs of a major algorithm update.
Google Panda Update: Everything We Know About Panda 4.2 (The SEM Post)
Google Panda 4.2 Is Here (SEL)
The Quality Update — May 3, 2015
After many reports of large-scale ranking changes, originally dubbed "Phantom 2", Google acknowledged a core algorithm change impacting "quality signals". This update seems to have had a broad impact, but Google didn't reveal any specifics about the nature of the signals involved.
The Quality Update: Google Confirms Changing How Quality IsAssessed, Resulting In Rankings Shake-Up (SEL)
Mobile Update AKA "Mobilegeddon" — April 22, 2015
In a rare move, Google pre-announced an algorithm update, telling us that mobile rankings would differ for mobile-friendly sites starting on April 21st. The impact of this update was, in the short-term, much smaller than expected, and our data showed that algorithm flux peaked on April 22nd.
Unnamed Update — February 4, 2015
Multiple SERP-trackers and many webmasters reported major flux in Google SERPs. Speculation ranged from an e-commerce focused update to a mobile usability update. Google did not officially confirm an update.
Google Brand-eCommerce “Update” causing fluctuations (Searchmetrics)
Social Bookmarking Websites List, Profile Creation Sites, High Pr Article Submission Site List, Press Release Submission Sites List, Classified Submission Sites List India, Business Review Website List, Business Listing Website List India, Product Listing Sites List, Ppt Submission Sites List, Onpage Technique For First Page Ranking