Snips:
"S. Shyam Sundar, a professor and founder of the Media Effects Research Laboratory at Penn State, has led students in several Facebook studies exploring identity. One involved the creation of mock Facebook profiles. Researchers learned that while people perceive someone who has a high number of friends as popular, attractive and self-confident, people who accumulate “too many” friends (about 800 or more) are seen as insecure.

"An important finding, Ms. Ellison said, was that students who reported low satisfaction with life and low self-esteem, and who used Facebook intensively, accumulated a form of social capital linked to what sociologists call “weak ties.” A weak tie is a fellow classmate or someone you meet at a party, not a friend or family member. Weak ties are significant, scholars say, because they are likely to provide people with new perspectives and opportunities that they might not get from close friends and family."