GomotesFacebook have their own official emoticons, these can be used in chats and private messages.
View a full list of the Facebook emoticons at Facebook Emoticon Codes or Messenger Emoticons.
The facebook emoticons are easy to read and very well adjusted.
You can choose from a 
smile emoticon up to a 
penguin emoticon.
Facebook added in 2013 a simple button to chats so you can easily use them for your conversations at Facebook.