TASK DEFINITION: In this task, you are given a text from tweets. Your task is to classify given tweet text into two categories: 1) positive, and 2) negative based on its content.
PROBLEM: @andijonas2009 very pretty pic...i'm sooo jealous...i'm not going anywhere good this summer! 

SOLUTION: negative

PROBLEM: @vickytcobra Voted  And you're 12th place! &lt;3

SOLUTION: positive

PROBLEM: Winner of the RSPCA Young Photographer Awards, for you pet lovers      [Link]

SOLUTION:
positive