Celebrites Affected by the Media?

[The Infected Rose]

I've to write an essay on how celebrities can be negative and positive influences on young people in society. One part however, must include examples of:
Celebrities who have been shattered by the media (criticised, their social status broken?)
Celebrities who have gained from the media (celebs who have grown because of the media, who have had positive press that have boosted their social status?)

I was wondering if anyone could give me a few examples of each as I have no idea about celebrity culture?
I think Demi Lovato would be an example of someone who has been criticised by media for being hospitalised for Bulimia? (Correct me if I'm wrong, I'm quite useless when it comes to celebrity facts)

Any examples are appreciated