Twitter Predicts Heart Disease

The New Yorker
What Your Tweets Say About You

Washington Post
Tweets can better predict heart disease rates than income, smoking and diabetes, study finds

New York Magazine
Can Angry Tweets Predict Heart-Disease Rates?

The Onion
Study Links Negative Tweets To More Heart Disease

~100 more articles 
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Press Releases:
University of Pennsylvania 
Association for Psychological Science
University of Melbourne


Measuring Personality through Facebook, not Surveys

New York Magazine
Here Are the Things Introverts Say on Facebook

Neuroskeptic
How Your Facebook Updates Reveal Your Personality


Measuring Life-Satisfaction through Twitter

The Atlantic Blog
Twitter Can Tell Whether Your Community Is Happy or Not


Personality On Facebook

Wired
Study: status update language used to predict Facebook users' age, gender, personality

Slate
Scientists Used Facebook For the Largest Ever Study of Language and Personality

MIT Technology Review 
How Your Facebook Profile Reveals More About Your Personality Than You Know

USA Today 
What your Facebook status says about you

New York Times Blog 
Your Personality Type, Revealed by the Internet

Psychologie Heute
Business Insider 
Daily Mail 
MIT Technology Review 
USA Today 
(terrible)

Press Releases: 
University of Pennsylvania