Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: The difference between someone's selfies when they're happy vs. unhappy is absolutely amazing.
This tweet contains emotions: 
joy, optimism, surprise