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With large drops, be wary against making a judgment call until at least a few days have passed.

Ranking algorithms fluctuate, competitors gain and lose links (and on-page optimization tactics) and search engines even flux between indices (and may sometimes even make mistakes in their crawling, inclusion or ranking processes).

Gaining or losing rankings for a particular term/phrase or even several happens millions of times a day to millions of pages and is generally nothing to be concerned about.

Google Insights for Search Available at google.com/insights/search - this tool provides data about regional usage, popularity and related queries for keywords.

Knowing the number of pages that receive search engine traffic is an essential metric for monitoring overall SEO performance.

The keywords that send traffic are another important piece of your analytics pie.

Inclusion is a privilege, not a right, so be cautious

When users share your content on Google+ with the +1 button, this activity is often annotated in search results.

Find directories or listings of relevant resources.

Earning the attention of the press, bloggers and news media is an effective, time honored way to earn links. Sometimes this is as simple as giving away something for free, releasing a great new product, or stating something controversial.

Earning the attention of the press, bloggers and news media is an effective, time honored way to earn links.

Search for sites like yours by using keywords and phrases directly relevant to your business.

leverages aspects of usefulness, information dissemination, or humor to create a viral effect

Build a company blog. Make it a valuable, informative and entertaining resource.

Check out this post on E-commerce links for more.

If you have partners you work with regularly or loyal customers that love your brand, you can use this to your advantage by sending out partnership badges

Potential Referral Traffic Link building should never be solely about search engines. Links that send high amounts of direct click-through traffic not only tend to provide better search engine value for rankings, but also send targeted, valuable visitors to your site

if you are trying to rank for the phrase "dog kennel", earning links from pages that already rank for this phrase would help significantly.

Self-Created, Non-Editorial Hundreds of thousands of websites offer any visitor the opportunity to create links through guest book signings, forum signatures, blog comments, or user profiles. These links offer the lowest value, but can, in aggregate, still have an impact for some sites.

Manual "Outreach" Link Building The SEO creates these links by emailing bloggers for links, submitting sites to directories, or paying for listings of any kind.