Most useful, perhaps, is the list of top keywords. These are the ones most frequently used in social media that relate to your search term. A bar chart also shows which are most popular and exactly how many times they appear.
Right below that are additional lists of top user names (people mentioning your topics) and top hashtags (terms people are using to reference your topic on Twitter.)
Finally, at the bottom of the sidebar is a list of social media sources where Social Mention has found mentions of your term, ranked by volume.