Facebook's redesigned Like button is finally here.

After months of testing, the social network is finally rolling out reactions to everyone, Facebook announced Wednesday. The update, which includes five new reactions — Love, Haha, Wow, Sad and Angry — will be available to all users in the next couple of days.

Practically, reactions are very similar to likes: hold down on the Like button on the app (or hover over it with your mouse, if you're on desktop) to view all the reactions and tap on the one you want to add to a post. As with likes, you'll be able to see how many people have reacted to a particular post or photo.

Considering how ubiquitous the "Like" is — and the implications of making such a big change to it — the update actually feels pretty intuitive, even if it may take some time to get used to the accompanying animations.

Still, it's not a change Facebook made lightly. The reactions rolling out today are the product of more than a year of research and experimentation, says Facebook Product Manager Sammi Krug. "We totally understand that the Like button is incredibly iconic, it’s been doing great things for Facebook for the last seven years."

Krug says the team spent months conducting research and surveying users to hone in on what, exactly, was missing from the Like button. (While Facebook users have been begging for a "dislike," option pretty much since the beginning of the Like, Mark Zuckerberg has spoken at length about why he thinks there should be more nuanced reactions than "dislike.")

The biggest consideration through it all though was finding sentiments so universal that they would be easily translate across all the countries where people use Facebook (which is just about everywhere.) That's also why the company chose to roll the feature out first to countries like Spain, Portugal, Chile, Japan and Colombia before bringing them to the rest of the world.

Though Krug said it's too early to say what changes could be made in the future — she didn't rule out adding new reactions or putting them in more places on Facebook in the future — she said they have already learned a lot about how people use the feature. "Yay," for example, was included in the initial rollout but has since been nixed — apparently because it was the least used. (Krug speculates it is too vague a sentiment compared with the rest.)

Less surprising, though, is the most popular reaction; and it could bode well for Facebook's chances of pleasing its notoriously change-adverse users.

“Love is consistently the most used reaction in all of our countries. In every single one of them it is by far the most used reaction.”

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