Today Facebook rolled out a rather significant change: the Like button has replaced the Share button's functionality. It's an important transition because, at least for me, it has already changed my "liking" behavior. Auto-publishing a story to my wall makes me think differently about the simple action of liking... which I do several times a day. With this new functionality, that would result in several feed posts and consequently annoy my friends / dilute the importance of my other posts. Below is an example of the feed post that resulted from liking a Mashable article. It auto-selects the image and summary.
In other news though, this post had over 5,000 Facebook Likes (way more than other articles)... so perhaps it does drive traffic: