Universal Search Results in the Google SERPs – USA 2012

Interesting Universal search study which is summarize with an infographic , paraphrasing the author of this post:

 This study is an analysis of Universal Search integrations in Google search results and specifically their distribution, number and development in the USA for 2012.

http://blog.searchmetrics.com/us/2013/03/28/universal-search-results-in-the-google-serps-usa-2012/