I saw an awesome repo full of emoji (emoticons) icons: https://github.com/jdaudier/refactoru-monsterthanks.
A quick Google search revealed this amazing resource http://www.emoji-cheat-sheet.com/.
Try it yourself. Those Emoji also work on Campfire, GitHub, Basecamp, Turntable.fm, Teambox, Trac,Flowdock, Sprint.ly, Kandan, Textbox.io, Kippt, GitLab, JabbR, Trello, Hall, plug.dj, Qiita, Zendesk, Ruby China,Grove and Idobata.
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