Jetpack – Social Media Plugins for wordpress
Indeed, with over 3 million active installs, Jetpack is one of the most widely used plugins out there. And since you may already have it installed, it’s worth mentioning that there are some powerful social media tools built right in.
Besides adding social sharing buttons, you can also automatically post your content to Facebook, Twitter, LinkedIn, and more through their Publicize feature. Your readers can also use their WordPress.com, Twitter, or Facebook accounts to comment on your posts. Who knew?
credit : Automattic