There is some confusion, about including "search description" meta content , in blog template code, to provide source for data shares to social sharing sites. In various topics in Blogger Help Forum: Get Help with an Issue , I've seen references to "data:post.metaDescription", "data:post.snippet", and "data:post.pageTitle" used, in providing the blog post source for the FaceBook "og:description" tag. As far as I can tell, none of these exist.
What Blogger won't tell you