The service is pretty clever and offers insight into your blog performance by merging social media measurement and quantitative data. The graph bellow shows an overview with timeline, indicators when you posted on your blog, and overall stats. Clicking on one of the post indicator leads to a more detailed report.
This detailed report shows individual posts with indication about the relative PostRank Engagement index, page views, time on page, and number of mentions in several social media outlets such as Twitter, Digg, Delicious, Reddit, etc. For individual posts, you also get all Twitter mentions.
Basically, PostRank Analytics allow you to better identify when, where, and how your audiences are engaging with your content, not only in the last week or month, but also today. It will help you find readers on all the important social hubs where they consume, organize and share content. You can not only see overviews of your audience engagement activity, you also see it as it happens, enabling better connection for timely conversation.