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When you click a like button you can do so for many reasons, that's why a lot of sites have replaced like buttons with a more comprehensive emoji button.
You can find the ☺ button alongside:
When you click it, a menu will appear with several emoji:
Available emoji under the react button
When you react to a picture, video, topic or comment, the author of that item will receive a notification.
And the reaction will be visible for all to see:
Reactions to a picture
The reactions of all fans will also be used to highlight the item on the "frontpages" of the forum, pictures and videos:
Highlighted pictures per reaction type