Today, Google introduced a new search feature that makes it easier for you to find forum posts or discussions related to what you are searching for. This new addition to Google search results applies to sites that tend to have a large number of posts on a specific topic. When several different discussions on a site are relevant to your query, Google will indent them under the primary result and include the date of each post.
So for instance, if you search for “getting from rome to florence” you will see, below the third result, a list of relevant discussions on various ways to get between these cities.

Surfacing forum posts in search results