Google Algorithm Updates 2015

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.

Significant Google Search Algorithm Update Yesterday (SER)

Google Brand-eCommerce “Update” causing fluctuations (Searchmetrics)

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.

Finding more mobile-friendly search results (Google)

7 Days After Mobilegeddon: How Far Did the Sky Fall? (Moz)

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 Is Assessed, Resulting In Rankings Shake-Up (SEL)

Google's 'phantom' algorithm update hits websites (CNBC)

Source From: https://moz.com/google-algorithm-change