Yup, based on a huge sample size of your daughter and her friends, that's the only completely factual conclusion that can be drawn.
Sharks, dinosaurs, or even dinosaurs riding sharks aside, there's still no generic stigma on Facebook and it is still used by people of all ages, and TONS of them.
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Sounds like TV, or even reading, or really many things in life if someone was to take them too far. A normal person who doesn't go nuts will not run into any more of that kind of stuff than they would without Facebook in their life. If it makes it easier for people to run into those "issues", then really the underlying "issue" is more with the people than anything else.