Facebook Harmfully more than helpful. There is so many reasons I found.
I got in one of the article https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970301/
A majority of students (84.1 %) accessed facebook on a daily basis while 44.9 % of them spent less than 1 h daily on facebook. One-fourth of the students accepted indulging in facebook until late night frequently, while 61.5 % admitted to doing so occasionally. The use of mobile devices was more common (76.5 %) among the participants than desktop/laptop for facebook use. A majority of students (54.6 %) usually accessed facebook while at their hostel. Among the majority of participants (52.7 %) the bedroom at the student's home was the favorite place to access facebook, while 29.4 % of students used the library at college for surfing facebook. Interestingly, 4.2 % of the students admitted to accessing facebook during lecture sessions, while most of the participants (51.5 %) also accessed facebook in other locations (like playground, corridor etc.)