May 2015 polling by Fluent among college students ages 17 to 25 found that the vast majority kept their social media activities limited to less than six hours daily. Just 11% of respondents said they spent six or more hours per day on Facebook—but that was still ahead of the 8% who spent that much time with Instagram (owned by Facebook) and the 3.4% who spent six or more hours daily reading and writing tweets.
Respondents were also significantly more likely to say they spent four to five hours per day with Facebook, at 15.6%. Only Instagram came close, at 10.3%. Facebook was ahead again among students who spent two to three hours daily. The bulk of students polled by Fluent spent less than an hour a day using each of the other social network properties cited.