Also, don't be surprised if Facebook's seemingly ubiquitous Like button looks different. The company is ditching the old "F" button in favor of one with the signature thumbs-up icon -- apparently, a 6 percent improvement in engagement was all it took to make the switch. You should notice other buttons (like Save or Share) getting a flatter, more consistent look. You'll see Like, Comment and Share buttons appear below some Instant Articles as well. These are all minor touches, of course, but they'll add up if you routinely share your tastes with your Facebook friends.