Yahoo introduces robots-nocontent for page sections

"Webmasters can now mark parts of a page with a 'robots-nocontent' tag which will indicate to our crawler what parts of a page are unrelated to the main content and are only useful for visitors.

We won't use the terms contained in these special tagged sections as information for finding the page or for the abstract in the search results

Addressing some comments and questions, with regards to links, the 'robots-nocontent' does not in any way affect how links are treated.

All links will continue to be used to find targets and will carry attribution to the target if they do not have the 'rel=nofollow' tag on them, whether or not they are inside a 'robots-nocontent' section."

Courtesy: ysearchblog