Google launched the support for organization mark up as per schema.org . This mark up is for organization logos which is a way to connect a site with its iconic image.
For example, a business whose homepage is www.example.com can add the following markup using visible on-page elements on their homepage:
<div itemscope itemtype=”http://schema.org/Organization”>
<a itemprop=”url” href=”http://www.example.com/”>Home</a>
<img itemprop=”logo” src=”http://www.example.com/logo.png” /> </div>
Markup like this is a strong signal to Google algorithms to show this image in preference over others, for example when we show Knowledge Graph on the right hand side based on users’ queries.
In fact lately I had observed many people adding the rel = “me” tag on static sites and by way of cross-linking their profile to their Google+ page the relevant image was getting displayed in SERPs.
This totally beats the purpose of the authorship mark up because in such cases I usually observed the site owner pics. which were getting displayed. As the publishership mark up did not get the green signal from Google this organization markup will surely help to keep a check on this and help the content to get correlated to the rightful authors which will in turn establish their thought leadership and of course the authority will also get passed on to the organization for which they write.
But the Rich Snippets Tool currently not displaying the logo in the preview although it detects the structured data on the URL tested.