Edit in JSFiddle

// Initialize author field
$('#inputor').atwho({
    at: "@",
    data:['Peter', 'Tom', 'Anne']
});

// Initialize city field within content editable
$('#inputcity').atwho({
    at: "@",
    data:['London', 'Stuttgart', 'Köln']
});

var emojis = [
  "smile", "iphone", "girl", "smiley", "heart", "kiss", "copyright", "coffee",
  "a", "ab", "airplane", "alien", "ambulance", "angel", "anger", "angry",
  "arrow_forward", "arrow_left", "arrow_lower_left", "arrow_lower_right",
  "arrow_right", "arrow_up", "arrow_upper_left", "arrow_upper_right",
  "art", "astonished", "atm", "b", "baby", "baby_chick", "baby_symbol",
  "balloon", "bamboo", "bank", "barber", "baseball", "basketball", "bath",
  "bear", "beer", "beers", "beginner", "bell", "bento", "bike", "bikini",
  "bird", "birthday", "black_square", "blue_car", "blue_heart", "blush",
  "boar", "boat", "bomb", "book", "boot", "bouquet", "bow", "bowtie",
  "boy", "bread", "briefcase", "broken_heart", "bug", "bulb",
  "person_with_blond_hair", "phone", "pig", "pill", "pisces", "plus1",
  "point_down", "point_left", "point_right", "point_up", "point_up_2",
  "police_car", "poop", "post_office", "postbox", "pray", "princess",
  "punch", "purple_heart", "question", "rabbit", "racehorse", "radio",
  "up", "us", "v", "vhs", "vibration_mode", "virgo", "vs", "walking",
  "warning", "watermelon", "wave", "wc", "wedding", "whale", "wheelchair",
  "white_square", "wind_chime", "wink", "wink2", "wolf", "woman",
  "womans_hat", "womens", "x", "yellow_heart", "zap", "zzz", "+1",
  "-1"
];

var emojis = $.map(emojis, function(value, i) {return {key: value, name:value}});

$('#emojis').atwho({
  at: ":",
  data: emojis,
  displayTpl: "<li>${name} <img src='https://assets-cdn.github.com/images/icons/emoji/${key}.png'  height='20' width='20' /></li>",
  insertTpl: "<img src='https://assets-cdn.github.com/images/icons/emoji/${name}.png'  height='20' width='20' />",
  insertTpl: ':${key}:',
  delay: 400
});

<p>
Type an author:
</p>
<textarea id="inputor"></textarea>
<br />

<p>
Type a city:
</p>
<div id="inputcity" contenteditable="true">Your Favorite City: </div>

<p>
Type an emoji e.g :smiley:
</p>
<textarea id="emojis"></textarea>
<br />