To react to an instant message:
You can easily react to a message by clicking or tapping someone else's reaction to use the same one.
To choose your own reaction:-
Select the smiley face button next to a message you've received. A selection of available reactions will display.
Note : New reactions will be added frequently and may differ by region. You can also customize your reaction picker. -
Swipe left or right on mobile or click the arrows on desktop to choose from additional reactions.
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Selecting the emoticon will send it automatically.
Note : On mobile, you can quickly like a message by double-tapping it.
To customize your message reaction picker:
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Select the smiley face button next to the message you want to react to.
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Select the Customize Reactions button.
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Select the minus button next to any reactions you want to remove from your reaction picker.
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Select the plus button next to any reactions you want to add to your reaction picker.
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You can have up to sixty reactions in the reaction picker. New reactions will be added to the front of your reaction picker.
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You can select more emoticons from the various categories at the bottom of the Customize your reactions window.
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Select Done to save your customized reaction picker.