Task: Categorize the tweet into an intensity level of the specified emotion E, representing the mental state of the tweeter. 0: no E can be inferred. 1: low amount of E can be inferred. 2: moderate amount of E can be inferred. 3: high amount of E can be inferred.
Tweet: Over 70% of social sharing is dark &amp; over 50% of web traffic comes from #darksocial. @colinzalewski #LIFTSocial
Emotion: sadness
Intensity class: 
1: low amount of sadness can be inferred