Emoji emoticons listed on this page are supported on Campfire, GitHub, Basecamp, Redbooth, Trac, Flowdock, Sprint.ly, Kandan, Textbox.io, Kippt, Redmine, JabbR, Trello, Hall, Plug.dj, Qiita, Zendesk, Ruby China, Grove, Idobata, NodeBB Forums, Slack, Streamup, OrganisedMinds, Hackpad, Cryptbin, Kato, Reportedly, Cheerful Ghost, IRCCloud, Dashcube, MyVideoGameList, Subrosa, Sococo, Quip, And Bang, Bonusly, Discourse, Ello, Twemoji Awesome, Got Chosen, Flow, ReadMe.io, esa, DBook, Groups.io, TeamworkChat, Damn Bugs, Let's Chat, Buildkite, ChatGrape, Dokuwiki, Usersnap, Discord, Status Hero, Bitbucket, Gitter, and YouTube.

However some of the emoji codes are not super easy to remember, so here is a little cheat sheet.
Got a modern browser or Flash enabled? Click the emoji code and it will be copied to your clipboard.

People

Nature

Objects

Places

Symbols

Campfire also supports a few sounds