The article, "Does Facebook Make Someone Social Offline?," says that in teenagers and young adults, facebook has helped connect with friends whom they would have lost touch with when gone off to college or that have moved away. Facebook studies were shown to help stay in touch with family members and "far-flun" friends. Though you're being indirectly social, a person is still being social and the effect eventually leads to being directly social. For friends to be allowed to share photos, posts and updates about themselves thats how friends and family keep up with one another and stay close.
The article provides more information on how facebook helps teenagers and young adults be social offline, to read more visit: http://www.nytimes.com/2011/01/30/fashion/30Studied.html?_r=1&ref=facebookinc