Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: A #smile brightens your day and the day of everyone around you, so remember to #smile, it's #free. :-)
This tweet contains emotions: 
joy, love, optimism