This happened with a cousin's sister during her high school days. There was one guy who wanted to make out with her by blackmailing her that otherwise he would release her pictures or videos publicly. At that time I was also young. He later got threatened or thrashed by her uncles. He used to roam around her house on his bike like a typical lafanga that you see in some movies. These things also keep happening at the school level. No one knows. Many girls give in to their requests for the fear that they will lose their respect.
I have seen some guys also expose their partners just because they cheated or broke up. This is almost equivalent to acid attacks.
There is only one thing we can do. We can act like you can't break us by doing that. We are stronger than you think. Secondly, we have to open up more if these things are happening to anyone. This education should be given at the school level. Because you never know when a boy of 10-12 years may record you when you were in the girl's toilet and start blackmailing you for favors. This should be part of sex education in schools.