There is no need to mince words: Facebook-ers have lower grades than non-users, according to a survey of college students, in which the Facebook-users' GPA was 0.5 less (3.0 to 3.5 compared to 3.5-40) than non-users, and they studied about 66% less (1-5 hrs/week compare t0 11-15 hrs.

To me, it seems that the Facebook-users are more efficient studiers or better prepared. They sliced off 66% of the study time with only a 13% drop in GPA. That's great! (Small print: but forget medical school or a top B-School.)

That...does not necessarily mean that Facebook leads to less studying and worse grades -- the grades association could be caused by something else. However, it does raise more questions about how students spend their time outside class on activities such as Facebook, part-time jobs and extracurricular activities.

For more about this study, go here.