While you're browsing, you'll always have a small column to the right of your screen with all of your Facebook friends, so you can interact with any of them with just a click on their icon. Meanwhile, on the left side of your screen you'll have another column that will keep you updated with your own Facebook notifications.
You can also share links, images, and status updates from within the browser's own interface. You can do all this quickly and with just one click.
Rockmelt includes all the normal features found in modern browsers, so by switching over, not only will you have some interesting new features, but you won't be missing out on anything else.