| | Google Algorithm updates 2018

2018 Updates "Medic" Core Update — August 1, 2018 Google confirmed a "broad core algorithm update," with wide reports of massive impact. It rolled out over the period of about a week, but peaked on August 1-2. This update seemed to disproportionately affect sites in the health and wellness vertical, although large-scale impact was seen in all verticals | |

Chrome Security Warnings (Full Site) — July 24, 2018 After warning users of unsecured (non-HTTPS) forms months earlier, Chrome 68 began marking all non-HTTPS sites as "not secure." The changes rolled out on July 24, but rely on users installing the latest Chrome version, which can take weeks or months | |

Mobile Speed Update — July 9, 2018 Six months after announcing it, Google rolled out the mobile page speed update, making page speed a ranking factor for mobile results. Google claimed that this only affected the slowest mobile sites, and there was no evidence of major mobile rankings shifts | |

Video Carousels — June 14, 2018 Google moved videos from organic-like results with thumbnails into a dedicated video carousel, causing a shake-up in results that were previously tracked as organic. At the same time, the number of SERPs with videos increased significantly (+60% in MozCast) | |

Snippet Length Drop — May 13, 2018 After testing longer display snippets of up to 300+ characters for a few months, Google rolled back most snippets to the former limit (about characters) | |

Mobile-First Index Roll-out — March 26, 2018 Google announced that the mobile-first index was finally "rolling out." Since the index has been in testing for many months, and Google has suggested they are migrating sites gradually, it's unclear how much impact this specific roll-out had on the overall index. Webmaster should begin to see notifications within Google Search Console | |

Zero-result SERP Test — March 14, 2018 On a small set of Knowledge Cards, including some time/date queries and unit conversion calculators, Google started displaying zero organic results and a "Show all results" button. A week later, Google stopped this test, but we believe it is an important sign of things to come | |

"Brackets" Core Update — March 8, 2018 Google confirmed a "core" update on March 7th, but volatility spiked as early as March 4th, with a second spike on March 8th, and continued for almost two weeks. This may have been multiple updates or one prolonged, rolling update. The "Brackets" name was coined by Glenn Gabe; no details were provided by Google | |

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