9Ellison, N. B. , Steinfield, C. , & Lampe, C. (2007). The bene- fits of facebook "Friends :" Social capital and college students' use of on-line social network sites. Journal of Computer - Mediated Communica- tion, 12, 1143-1168.
10Greenhow, C. , & Burton, L. (2011). Help from my "friends": Social capital in the social network sites of low - income students. Journal of Educational Computing Research, 45, 223 - 245.