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Manual Review

All major search engines combine a manual review process with their automated relevancy algorithms to help catch search spam and train their relevancy algorithms. Abnormal usage data or link growth patterns may also flag sites for manual review.

Mobile usability report

shows which pages in your property have usability problems when viewed on mobile devices.

Machine Learning

Machine learning is the scientific study of algorithms and statistical models that computer systems use in order to perform a specific task effectively without using explicit instructions, relying on patterns and inference instead. It is seen as a subset of artificial intelligence.

Manual Action

are Google's way of demoting or removing web pages or websites as a whole. They aren't related to Google algorithm changes like Penguin, Panda, Hummingbird, or the others. They are simply Google manually punishing websites for spammy behavior.

Mechanical Turk

Amazon.com program which allows you to hire humans to perform easy tasks that computers are bad at.

Meme

In The Selfish Gene Richard Dawkins defines a meme as "a unit of cultural transmission, or a unit of imitation." Many people use the word meme to refer to self spreading or viral ideas.

Meta Description

The meta description tag is typically a sentence or two of content which describes the content of the page.

A good meta description tag should:

be relevant and unique to the page;
reinforce the page title; and
focus on including offers and secondary keywords and phrases to help add context to the page title.
Relevant meta description tags may appear in search results as part of the page description below the page title.

The code for a meta description tag looks like this

Meta Feeds

Ad networks that pull advertiser listings from other providers. They may or may not have their own distribution and advertiser networks.

Meta Keywords

The meta keywords tag is a tag which can be used to highlight keywords and keyword phrases which the page is targeting. The code for a meta keyword tag looks like this <meta name="Keywords" content="keyword phrase, another keyword, yep another, maybe one more "> many people spammed meta keyword tags and searchers typically never see the tag, so most search engines do not place much (if any) weight on it. Many SEO professionals no longer use meta keywords tags.

Meta Refresh

A meta tag used to make a browser refresh to another URL location. A meta refresh looks like this

Generally in most cases it is preferred to use a 301 or 302 redirect over a meta refresh.

META Refresh redirect - A client-side redirect.

Meta Search

A search engine which pulls top ranked results from multiple other search engines and rearranges them into a new result set.

Meta Tags

People generally refer to meta descriptions and meta keywords as meta tags. Some people also group the page title in with these. The page title is highly important.The meta description tag is somewhat important. META tags Statements within the HEAD section of an HTML page which furnishes information about page. META information may be in the SERPs but is not visible on the page. It is very important to have unique and accurate META title and description tags, because they may be the information that the search engines rely upon the most to determine what the page is about. Also, they are the first impression that users get about your page within the SERPs.

Metrics - A system of measures that helps to quantify particular characteristics. In SEO the following are some important metrics to measure: overall traffic, search engine traffic, conversions, top traffic-driving keywords, top conversion-driving keywords, keyword rankings, etc.

MFA Made For Advertisements - websites that are designed from the ground up as a venue for. This is usually, but not always a bad thing. TV programming is usually MFA.

Microsoft

Maker of the popular Windows operating system and Internet Explorer browser.

Mindshare

A measure of the amount of people who think of you or your product when thinking of products in your category. Sites with strong mindshare, top rankings, or a strong memorable brand are far more likely to be linked at than sites which are less memorable and have less search exposure. The link quality of mindshare related links most likely exceeds the quality of the average link on the web. If you sell non-commodities, personal also typically carry far greater weight than search rankings alone.

Minimum Bid

The least amount that an advertiser can bid for a keyword or keyword phrase and still be active on the search ad network. This amount can range from $0.01 to $0.50 (or more for highly competitive keywords), and are set by the search engine.

Mirror Site

Site which mirrors (or duplicates) the contents of another website. Generally search engines prefer not to index duplicate content. The one exception to this is that if you are a hosting company it might make sense to offer free hosting or a free mirror site to a popular open source software site to build significant link equity.

Mod_rewrite

URL Rewrite processes, also known as “mod rewrites,” are employed when a webmaster decides to reorganize a current web site, either for the benefit of better user experience with a new directory structure or to clean up URLs which are difficult for search engines to index.

Movable Type

For sale blogging software which allows you to host a blog on your website. Movable Type is typically much harder to install that Wordpress is. monetize To extract income from a site. Adsense ads are an easy way to Monetize a website.

Multi Dimensional Scaling

The process of taking shapshots of documents in a database to discover topical clusters through the use of latent semantic indexing. Multi dimensional scaling is more efficient than singular vector decomposition since only a rough approximation of relevance is necessary when combined with other ranking criteria.

Multivariate Testing

A type of testing that varies and tests more than one or two campaign elements at a time to determine the best performing elements and combinations. Multivariate testing can gather significant results on many different components of, for example, alternative PPC ad titles or descriptions in a short period of time. Often it requires special expertise to analyze complex statistical results. (Compare to A/B Testing which changes only one element at a time, alternately serving an “old” version ad and a changed ad.) In search advertising, you might do A/B Split or Multivariate testing to learn what parts of a landing page (background color, title, headline, fill in forms, design, images) produce higher conversions and are more cost effective.