By Kelly Grainger, CreoLogic Design Inc.
192. Hacked Site: If your site gets hacked it can get dropped from the search results. In fact, Search Engine Land was completed deindexed after Google thought it had been hacked.
193. Unnatural Influx of Links: A sudden (and unnatural) influx of links is a sure-fire sign of phony links.
194. Penguin Penalty: Sites that were hit by Google Penguin are significantly less visible in search. Although, apparently, Penguin now focuses more on filtering out bad links vs. penalizing entire websites.
195. Link Profile with High % of Low Quality Links: Lots of links from sources commonly used by black hat SEOs (like blog comments and forum profiles) may be a sign of gaming the system.
196. Links From Unrelated Websites: A high-percentage of backlinks from topically-unrelated sites can increase the odds of a manual penalty.
197. Unnatural Links Warning: Google has sent out thousands of “Google Search Console notice of detected unnatural links” messages. This usually precedes a ranking drop, although not 100% of the time.
198. Low-Quality Directory Links: According to Google, backlinks from low-quality directories can lead to a penalty.
199. Widget Links: Google frowns on links that are automatically generated when user embeds a “widget” on their site.
200. Links from the Same Class C IP: Getting an unnatural amount of links from sites on the same server IP may help Google determine that your links are coming from a blog network.
201. “Poison” Anchor Text: Having “poison” anchor text (especially pharmacy keywords) pointed to your site may be a sign of spam or a hacked site. Either way, it can hurt your site’s ranking.
202. Unnatural Link Spike: A 2013 Google Patent describes how Google can identify whether or not an influx of links to a page is legitimate. Those unnatural links may become devalued.
203. Links From Articles and Press Releases: Articles directories and press releases has been abused to the point that Google now considers these two link building strategies a “link scheme” in many cases.
204. Manual Actions: There are several types of these, but most are related to black hat link building.
205. Selling Links: Getting caught selling links can hurt your search visibility.
206. Google Sandbox: New sites that get a sudden influx of links are sometimes put in the Google Sandbox, which temporarily limits search visibility.
207. Google Dance: The Google Dance can temporarily shake up rankings. According to a Google Patent, this may be a way for them to determine whether or not a site is trying to game the algorithm.
208. Disavow Tool: Use of the Disavow Tool may remove a manual or algorithmic penalty for sites that were the victims of negative SEO.
209. Reconsideration Request: A successful reconsideration request can lift a penalty.
210. Temporary Link Schemes: Google has caught onto people that create — and quickly remove — spammy links. Also know as a temporary link scheme.