TASK DEFINITION: In this task you are given a tweet. You must judge whether the author of the tweet is sad or not. Label the instances as "Sad" or "Not sad" based on your judgment. You can get help from hashtags and emojis, but you should not judge only based on them, and should pay attention to tweet's text as well.
PROBLEM: the man was staring at him intensely, not smiling but not frowning either. just looking at him. 'you should sleep some more' the man says

SOLUTION: Sad

PROBLEM: @SFBART This driver is telling the passengers we did a very good job and saved a life today. That's it. #tears

SOLUTION: Not sad

PROBLEM: Julia and I are finally going to be able to meet PTX #crying

SOLUTION:
Sad