Two thirds of children aged 3 to 17 use social media apps and children aged 8 to 17 spend on average between two and five hours online per day.
Mae dau draean o blant 3 a 17 oed yn defnyddio apiau’r cyfryngau cymdeithasol, ac mae plant 8 a 17 oed yn treulio rhwng dwy a phump awr y diwrnod ar-lein.