I have been seeing this plugin on some major blogs like Mashable and I like it.
I first starting noticing it because of the odd way it behaves on the site. When you scroll down the site it follow you. This widget is called the Sharebar Wordpress Plugin.
So what is Sharebar? It is a WordPress Plugin which makes it quite easy for your visitors to share you blogs posts and pages on their favorite social media sites. Social media is hot especially Facebook. The easier you make it for your visitors to share you content the more they will do so. This in turn means more traffic and fans for your site.
Please visit here to view the full review of Sharebar WordPress Plugin.