This being probably the most notable finding from the final version of the "study of tens of thousands of keywords and more than half a million domains" headed "Schema.org in Google search results" (see the request button at the bottom of the page for the full PDF):
The study authors are quick to note that correlation does not necessarily imply causation, although they correctly acknowledge that there's a logical connection between structured data use and search engine visibility.
"Whether the use of HTML markups does genuinely affect the ranking of a domain, as it would appear from the data, is hard to say. In fact, it may be due in part to interaction with other factors."
"However, it can be said that the inclusion of HTML tags from schema.org to clearly flag up the content of the page will greatly help search engines better understand the Web’s content – and that is an essential consideration for a good ranking."
Other notable factoids from the study:
- Only 0.3% of domains in their sample included schema.org 
- "Google enhances search results with schema.org markups in more than 36% of keyword queries" 
- Movie, Offer, TVSeries and Review were the item types that most often ended up generating rich snippets in the SERPs (compare this to the most common schema.org classes by domain from the lastest Common Crawl data - WebPage, Article, Blog, Product - and most common schema.org classes by no. of entities - Product, Offer, Person, PostalAddress, Organization)
 Making for the best pie chart evah
 I'm interpreting this as "for 36% of our sample queries we observed a rich snippet in the top 50 results [their query depth] that appeared to be based on the presence of schema.org markup." The language of this study leaves a lot to be desired.
#schemaorg #structureddata #google #seo
I recommend to have a look at this discussion on twitter. Short, but still very impressive.
Death hit our family. My brother Joe Britsios born on the 27th of December 1977 died several hours ago (20:00 UK time). And our father died this day 7 years ago.
God bless you brother, and rest in peace.
- SEO Workers, GermanyForensic SEO & Social Semantic Web Consultant, 2006 - present
- Webnauts Net, GermanyAccessibility & Usability Consultant, 2001 - present
- Lycos EuropeLead of Usability Testing, 2001 - 2003
- Ronacher Theater, AustriaEvening Duty Manager, 1993 - 1995
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- College of Police Sciences, GreeceStudies Director, 1991 - 1993
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In 2001, I graduated from the German Academy Brueschke in Bielefeld as a Specialist for Multimedia Office Communication.
The same year, I graduated from the Academy of the German Chamber of Commerce and Industry in Bielefeld as a Web Project Manager (IHK).
Additionally, in 2003 I passed an exam at Brainbench.com in Web Design Concepts. Also, in 2003 I passed my test at Brainbench.com as a Master Web Designer for Accessibility.
In the same year, I completed an online course of study at Carleton University, Sprott School of Business in Usability Testing.Lycos Europe Inc. in various positions for two years:
- 04.2001 - 07.2001 Intranet Webmaster;
- 07.2001 - 03.2002 Ad Format Specialist;
- 07.2001 - 03.2002 Trainer for Web Design for Accessibility;
- 03.2002 - 04.2003 Lead of Usability Testing, supervising the usability tests for the European Web Development.
I also hold membership with the following professional organizations:
- The Guild of Accessible Designers;
- Web Standards Group;
- Internet Society (ISOC);
- Interaction Design Association (IxD).
- Florida State UniversityFSU Certified Webmaster, 2004 - 2004