Para.4 1.Fuel self-esteem. In a Cornell University study,students felt better about themselves after they updated their Facebook profiles;a control group of students who didn't log onto the site didn't experience such a mood lift facebook Presldent Obama Lgn0创sp似Fat0otod圆 180,341nugPara.4 1. Fuel self-esteem. In a Cornell University study, students felt better about themselves after they updated their Facebook profiles; a control group of students who didn’t log onto the site didn’t experience such a mood lift