Sitelinks are the  links shown below some sites in google’s search results, called sitelinks, they are meant to help users navigate your site. Google’s systems analyzes the link structure of your site to find shortcuts that will save users time and allow them to quickly find the information they’re looking for.

Recently while doing a google search i noticed Google  was tweaking the information sitelinks shows  and it seems to be that they’re adding the number of comments to some sitelinks.