Last September, Google added methods for controlling elements of your search results snippets. Last week, Bing also announced similar controls that it will begin supporting later this Spring. Bing said “Now, with these new features, webmasters will have more control than ever before to determine how their site is represented on the Bing search results page.”
Here are these new snippet meta tags:
Specify the maximum text-length, in characters, of a snippet in search results.
<meta name="robots" content="max-snippet:400" />
<meta name="robots" content="max-image-preview:large" />
<meta name="robots" content="max-video-preview:-1" />
You can combine them as well.
When is this launching? Bing said “Over the following weeks, we will start rolling out these new options first for web and news, then for images, videos and our Bing answers results. We will use these options as directive statement, not as hints.”
Forum discussion at WebmasterWorld.