An analysis of the language in social media messages posted via the Internet determined that, on average, the use of words associated with positive moods is common in the morning, decreases gradually to a low point midaftemoon, and then increases sharply throughout the evening. This shows that a person' s mood typically starts out happy in the morning, declines during the day, and improves in the evening.
The possibility that the number of social media messages posted in the morning is not significantly different from the number posted in the evening makes the reasoning in the argument most vulnerable to criticism.