Deciding whether to look after them, to like it, or leave it: A multidimensional analysis of predictors of positive and negative bystander behavior in cyberbullying among adolescents.

•Predictors of cyberbullying bystander behavior are studied among 1979 adolescents.•A multilevel and multidimensional approach was used.•Negative (e.g. passive) and positive (e.g. defending) behavior were studied.•School and class factors were not strong predictors of bystander behavior.•Predictors are multifaceted, and different for negative and positive bystanding.