Task: Evaluate the tweet for emotional cues and classify it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that indicate the tweeter's state of mind.
Tweet: A #smile can mean a thousand words, but it can also hide a thousand #problems. #Fact #TeamFollowBack
This tweet contains emotions: 
joy, optimism, sadness