Use: Increase exposure of related content to articles that show up in Google search
In early August, Google began rolling out a new search feature called “In-Depth Articles.” The feature will surface content relevant to specific search results to provide users with more background on searched topics. According to Google: “these results are ranked algorithmically based on many signals that look for high-quality, in-depth content.” (See link below to similar Twitter feature launched on August 20).
So, for example, if a user searches for Edwin Snowden, a list of in-depth articles will appear below search results and might include stories about the NSA Prism program, reaction from foreign governments, tensions between the U.S. and Russia over granting of asylum, etc.
Update 8/21/2013: Mashable: Twitter Provides Context With Related Headlines Feature