http://news.cnet.com/8301-1023_3-57581618-93/facebooks-finch-stickers-put-livelier-face-on-messaging/

http://techcrunch.com/2013/04/26/facebook-animated-stickers/

 

http://www.buzzfeed.com/justinesharrock/how-darwin-inspired-emoticons-became-facebook-stickers