Easily done--you can even use the built-in "share" button at the bottom of each of your articles. Click on that, and you will get an entire menu of places to share.
Click on "Face Book," and you'll get a pre-filled dialogue box, to which you may add any comment you'd like, then hit the button to post, and you're done.
Not only will your immediate friends see it, but also anyone else allowed to see your wall, depending upon the privacy settings you've chosen for Face Book.
This can help your external traffic greatly.