Teenagers who regularly play online video games tend to improve their school results, according to new research from RMIT University in Melbourne, Australia.
But school students who visit Facebook or chat sites every day are more likely to fall behind in maths, reading and science.
Associate Professor Alberto Posso, from RMIT's School of Economics, Finance and Marketing, investigated the results of testing by the globally recognised Program for International Student Assessment.
PISA tested more than 12,000 Australian 15-year-olds in maths, reading and science, as well as collecting data on the students' online activities.
Posso said video games could help students to apply and sharpen skills learned at school.