You can also use emoticons as a sort of simple, multi-lingual signal about the emotion expressed in a tweet. :) -> happy, :( -> sad, and so on. I found out abou

You can also use emoticons as a sort of simple, multi-lingual signal about the emotion expressed in a tweet. :) -> happy, :( -> sad, and so on. I found out about this while researching sentiment analysis techniques last summer; here's a good paper: http://dl.acm.org/citation.cfm?id=1628969 http://dl.acm.org/citation.cfm?id=1628969.