At this age they are socialising online for the first time and building friendship groups which mean they could face issues such as online peer pressure and cyberbullying.
They may be exposed to content that is inappropriate for their age, especially if their using devices outside the home that aren’t protected by the correct parental controls.
Children at this developmental stage are more impulsive and so may not be fully conscious that they are creating a digital footprint that will affect them as they grow older.