[Notice] To anyone trying to use in 2020 with fontawesome 5

[Puyodead1]

Took me a while of messing around to figure this out, but if emojis are not showing, here's why...
you need to add this to your page:

$(function() {
            window.emojiPicker = new EmojiPicker({
                emojiable_selector: '[data-emojiable=true]',
                assetsPath: '/path/to/emoji-picker/img/',
                popupButtonClasses: 'far fa-smile'
            });
            window.emojiPicker.discover();
        });

the demo uses fontawesome 4 and an emoji name that does not exit. so you need far fa-smile

[pabloldeoliveira]

This worked for me, thank you!