Facebook continues to tweak its reactions function, now implementing the added expressions to comments. Users will be able to indicate "love," "haha," "wow," "sad" and "angry" to individual replies, as opposed to news feed posts alone.

“We’ve heard from people they’d like more ways to show their reaction in conversations on Facebook, so we’re rolling out the ability to react to comments," a Facebook spokesperson said in a statement.

The new reactions to comments option is currently rolling out slowly to select users.

Facebook also recently introduced a mysterious rocket icon; here's what it does.

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