Social media pushes the illusion that you are not engaging with professionals but peers, and the dominant signals (how many views, likes, comments, etc.) of this day and age were not present with TV. This seriously messes with the innate reasoning of most humans, because for all our individualism we are norm conforming herd animals.
Show a kid a celebrity pushing something and they can tell it's fake. If the same thing is pushed by all of their friends, now we're in the territory of peer pressure which is a different ball game!
No, they cant.
How many kids believe the photoshop pics they see?
Not to single her out, but Kim K is now selling headphones and her pic in her ad makes her look like a character from the sims. This is NOT how a normal human being looks without hours of photoshop work.
There is a reason we use to have laws around advertising to children.. they are too young to understand things.. this is also why you cant legally enter into a contract with a minor.