Examine the tweet "@justinbieber Thank u Justin for this amazing concert. I can't believe that only u can provoke these thousand smiles these night#BelieveTour" and determine which of these emotions are present: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If there are no identifiable emotions, reply with "neutral or no emotion".
joy, love, optimism