PostRank (www.postrank.com) is a service that gathers data about blog posts, showing how many comments, tweets, bookmarks, and other various shares have been applied to those posts through social media. PostRank takes all this data, combines it with some analytics data, and then rates your post on a scale from 1 to 10.
Within the PostRank system, you can also rank blogs within your niche, subscribe to blogs, and even get expanded analytics (expanded analytics do cost a small monthly fee).
Combining the PostRank plugin with Google Analytics shows you the numbers related to how users view, share, or discuss your posts in various social-media outlets — and PostRank also shows you specifically where these discussions are taking place, which Google Analytics doesn't do. You can use this information to figure out how much your posts need to be shared to obtain the numbers you're seeing from Twitter, Delicious, and other services.
To install the PostRank plugin, follow these steps:
Your WordPress Dashboard appears.
The search menu appears so you can search for the plugin, using keywords of your choice.
A page of search results appears.