The year of 2011 was harsh! The biggest algorithm changes to ever hit the web destroyed business models and forced ecommerce websites and content farms to start treating their Web properties with a little more TLC. Here are the most significant web content changes of 2011.

Panda – The Beginning – February 23, 2011

Panda was the beast of 2011. It seemed like Google tweaked the algorithm every few weeks, and a long list of sites got hammered. This update affected 12 percent of queries and directly affected content farms and sites with thin and duplicate content.

The Never-Ending Panda Updates of 2011

To paint a picture of the breadth of Panda’s wrath throughout the year, I’ve  mentioned all of the major Panda updates. The one Feb ’11 change was the first roll out, and seven updates followed in 2011. Look out for more in 2012…you know they’re coming.

(There was no 3.0…I know, weird)

Data Gets Richer – Schema.org – June 2, 2011

The search engines came together for the first time since they created a standard for site maps to create another standard—schema.org. This is micro data that will be displayed in the search results. This markup has the potential to drive up click-through rates by displaying richer data, such as images and starred reviews. It is also the beginning of giving away your content to the search engines, which leaves a lot of SEO experts thinking, “If the search engines are displaying information from my Web pages, why should a user click through to a page?”

The adoption of schema is different per industry. The bacon pie “industry”
is apparently leading the way. Which is no surprise since many of us eat with our eyes, and most of us love bacon.

Brands are King with Expanded Site Links – August 16, 2011

Branded search terms are now taking up a lot of real estate in the SERPs. Expanded site links display a six-pack of navigation links in the search results for brand websites.

Servio Site Links 

Its reputation is now positive and it offers a navigational element above the fold for a company name query. If consumers want to learn more about the brand, using the brand name + *reviews” (or something synonymous) will knock out the site links.

No More Stale Content – Freshness Update – November 3, 2011

The long-known algorithm Query Deserves Freshness (QDF) has expanded with the Freshness Update. QDF was implemented for news stories. It has been rolled out to impact even more queries that should deliver fresh results. The report was said to impact 35% of queries.

Google explained that this algorithm update affects 3 types of queries, which gave internet marketers great insight into what would keep their content at the top.

Frequent updates would be more product related. The example given by Google in its announcement here explained:

“For example, if you’re researching the [best slr cameras], or you’re in the market for a new car and want [subaru impreza reviews], you probably want the most up to date information.”

Google will focus a lot more on fresh content in 2012 for news, events and product information. To learn more, sign up for the free webinar Rand Fishkin and I are hosting about ‘Content, Freshness and SEO for Large Sites: What’ s Important in 2012’.

 Honorable Mentions

The algorithm changes here did not make the big list, mainly because the effects were indirect. But they are worthy of mentioning.

Query Encryption (not provided) – October 18, 2011

This update did not make the main list because it did not affect the content directly. It affects data, which then affects your content (which is huge). Google started encrypting data, which caused some organic keyword data in Google Analytics  to show “(not provided)” rather than the valuable data that used to be displayed. This was a huge blow to White Hat SEOs, who relied on Analytics’ organic search data to craft, measure, and tweak their SEO plans.

Google Gets Social with Google+ – June 28, 2011

Google launched its Facebook competitor, Google+ in June.   The focus is on sharing and liking content.   Plus has started to integrate more and more into Google search and will be increasingly important in 2012.

Google introduces the product here.

Google Gets Transparent with 10-Pack Updates Nov 14 and Dec. 1

For the first time, Google reports its algorithm updates on its Inside Search blog. Google, in an effort to be more transparent, is now publishing its algorithm updates. Two have been published to date here:

Nov. 14
Dec. 1

The search engines are getting stricter, which means your content needs to stand the test of time. More changes are to come in 2012.

Big thanks to the living document at Google Algorithm Changes from SEOMoz. Without you this would have taken much longer.