If you didn't notice the toolbar like in the bottom of websites pages then you might want to take a look at mashable toolbar, If you want one for your blog, website or whatever there is a free better looking alternative "
Wibiya" out of beta and for free, just apply with your blog or site link, after a little review they will send you the instruction and your password, the toolbar is fully customizable to match your design with lots of applications you can use, video & chat for your visitors, face book integration, social bookmarking, how many users online, notifications, twitter, rss and more example :
Technolibya.com
