I have forums website, and I am looking through Google search engine, and I can see that some (not mine) forums have something like this under the link of the site:28 nov 2005 - Number of posts: 4 - Number of authors: 3 (This may not be exactly what this text since I translated it from my native language)How do I get this information to appear? What do I need to add to my forum in order for Google to catch it?I am aware of microdata, I just don't know which one (and how) should I use here.
How to get number of posts to appear in extended information section?
seo;google;forum;microdata
Google does this automatically; it's not based on any particular micro data or tags in the html code. As far as I know, Google just looks at the content on your forum. This makes for a very impressive trick! This feature was described on the Google blog several years ago:Today, we introduced a new search feature that makes it easier for you  to find forum posts or discussions related to what youre 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, we indent  them under the primary result and include the date of each post.The biggest problem is that often times the post/author count is out of date, even after the thread has been archived for a while.  Google doesn't disclose how it crawls the data so it's possible that adding in some microdata could improve the accuracy of the results.  We theorized that adding a thread's page number to the html title on each page in a given thread would help Google but results were inconclusive. Read more on this experiment: http://www.ninjapost.com/blog/improving-seo-for-forum-search-results/)