Today the iconic Facebook “like” button got 5 new emoji friends. Last October Facebook started testing a suite of six complements to the like button: “love,” “haha,” “yay,” “wow,” “sad,” and “angry.” “Yay” didn’t make the cut.

Check out the new buttons by holding down the like button on your phone or tablet or hovering over it on your desktop. Tap the emoji reaction you want, and the icon for it will appear beneath the post, just as the like icon does.

Facebook explained the new feature, called Reactions, in a blog post:

“We’ve been listening to people and know that there should be more ways to easily and quickly express how something you see in News Feed makes you feel. That’s why today we are launching Reactions, an extension of the Like button, to give you more ways to share your reaction to a post in a quick and easy way.”

Make no mistake, like almost everything Facebook does, there is an ulterior motive. They were not just reacting to users asking for a dislike button. These new emojis enable Facebook to enrich the data set and make it even more sticky. They can use it to personalize your feed so that it never becomes so stale, repetitive, or overwhelming to the point where you might be tempted to look elsewhere for your fix of updates.

From the very beginning, the like button has been a key source of data. If you liked something, you were telling Facebook to show you more of it. And they did. Now with reactions they will learn more about nuances and be able to better decipher your sentiment based on types of content.

According to the blog post from Facebook:

“Initially, just as we do when someone likes a post, if someone uses a Reaction, we will infer they want to see more of that type of post. In the beginning, it won’t matter if someone likes, “wows” or “sads” a post — we will initially use any Reaction similar to a Like to infer that you want to see more of that type of content. Over time we hope to learn how the different Reactions should be weighted differently by News Feed to do a better job of showing everyone the stories they most want to see.”

The vocabulary is going to get interesting. So now…are we supposed to say “I sadded your post”?