Barbara Starr of SearchEngineLand reports, "Semantic markup is becoming more and more popular in conjunction with large scale SEO. Adding rich snippets to send rich signals to alert search engines as to the relevancy of your content − whatever vertical they may appear in − is not only a wise move, but an SEO best practice. Included below is an illustrative guide highlighting currently available Chrome extensions, which you can leverage to both test on-site markup as well as expose any information regarding your competitors. An example is illustrated [above], and what follows is a guide to getting the information."
She goes on, "The result set above, is merely to pique your interest, as an initial look at the current Chrome extensions/apps appear somewhat boring. Let’s take these apparently trivial apps for a ride and see what they can do! An additional FYI – they are all free. To start off, I just checked out what I have installed in Chrome, and as a caveat here, I am only going to write about tools I have experience with and trust. As a first step, go to the Chrome store and type in the word 'microdata.' You can see my results below; I installed all four microdata extensions. This assumes you have Chrome installed as a browser."
Image: Courtesy Search Engine Land