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: Look at us, smiling in the photograph♪ You can see the secrets behind the fake smiles♪ (*・ω・*) (©FACT「a fact of life」)
This tweet contains emotions: 
joy