I think that people under the age of 16 should be excluded from social media because it does more harm than good.
First of all, body images are very central and influential when reached by a younger crowd. ( along with older ones too ofcource )
Second of all, it can inflict trying adult behaviors from an early age, something that is not so kindly advised. ( such as drinking, smoking, and other mature themes ), Making the children discover these themes before their own good.