PowerInbox

PowerInbox is an extension for Google Chrome. It brings an experience to email. With PowerInbox you can enjoy your favorite social networks right in your Gmail, Yahoo!Mail or Hotmail and stay social without ever leaving your inbox. PowerInbox lets you stream live social feeds from Facebook, Twitter, LinkedIn, and Instagram right inside our handy Inbox Sidebar. A Facebook email lets you comment back on a photo, a LinkedIn email lets you accept connections or a Twitter email lets you tweet and follow back.

Requirements:

Google Chrome Beta Channel