New research from NM Incite, a Nielsen McKinsey company, reveals that there are innumerable factors that help Facebook users decide to add a friend or cull someone from the fold, though knowing someone in real life is the top reason cited for friend-ing someone (82%) and offensive comments are the main reason someone gets the boot (55%).

Source: http://www.nmincite.com/

See also Infografic: How Facebook Affects Your Relationships http://en.inmoreau.com/758