Few days back I have covered a post on Tweetmeme button to get more Retweets. Providing an easy interface to share your blog post always help to drive more traffic. More interesting is to see stats of share.
Facebook Share button is one such plugin for wordpress to see share count of your blog post on facebook. This also help users to easily share your blog post on facebook.
Many popular blog like mashable are using this plugin and obviously they are getting lots of traffic and share using this facebook share count button.
Chances are high initially you might not get many share count on your blog posts, but once users will get used to it and you can see increasing number of shares on your blog post.
if you are not using any social media sharing buttons on your blog, you should do it now. This will help your reader to quickly stumble, tweet, digg and save your post on delicious. This will help them to quickly bookmark your posts for later use.