| qs | (Quality Score) A variable used by Google AdWords that influences both ad rank and CPC. The formula used to determine ad order is (bid x QS). |
| john mueller | Juhn Mueller is the current head of Googles Webspam team. He hosts regular hangouts on the Google Webmasters channel. Webmasters from all around the world can ask questions about SEO and website performance there, and John will answer. |
| free for all | FFA is a page or site with many outgoing links to sites that are unrelated or provide the user very little unique content. These are also known as link farms and are created for the solely purpose of boosting rankings. They provide little valuable and are looked upon unfavorably by search engines. |
| noreferrer | Noreferrer is a value that can be assigned to the rel attribute which tells the browser not to leak any HTTP refferer information, and is used in conjunction with noopener to protect against reverse tabnabbing. It does not have an impact on SEO in a link that it is added to. |
| spambot | A spambot represents an automated program which assists the sending of spam. Spambots can harvest email addresses, on chat rooms or web forms. |
