That counts as exposure to violent content, and Dr. O'Keeffe says it can be especially scary to big kids, who understand that it's real.

CNN: Is media violence damaging to kids?

But 80% of stalkers are men and a lot of those do become dangerously obsessed, and it can be very scary, especially for young women.

BBC: When love becomes fatal obsession

"If you can imagine going though life not understanding what people are saying to you and not being able to communicate how you are feeling, it can be a really scary place, " she says.

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While information found online about MDS can be "some scary stuff, " Roberts said her doctors told her it doesn't apply to her.

CNN: Robin Roberts reveals MDS diagnosis