Why do I feel envious when other people have tons of facebook likes?

[Mere Exposure]

"...you may envy Napoleon, but Napoleon envied Caesar, Caesar envied Alexander, and Alexander, I daresay, envied Hercules, who never existed.”

“Envy is a symptom of lack of appreciation of our own uniqueness and self worth. Each of us has something to give that no one else has.”

“Envy is the art of counting the other fellow's blessings instead of your own.”