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: Time to go hit up the library - I have a lovely PILE of book reservations to collect this morning... #glee #books #reading
This tweet contains emotions: 
joy