It appears that Google is doing some testing with showing relevant blogposts instead of actual site links under certain search results. This is pretty interesting because it will show the actual blogpost title as well as the date it was posted.  I found this information in a recent blogpost on Search Engine Land. Below is the screenshot they showed in this blogpost showing how Google normally shows sites with relevant site links in comparison to the testing in which they are showing relevant blogposts:   

Be on the lookout for this in search results. Although it appears to be only in testing now, it may be out of testing real soon.