The most hated woman in the US

Megan Mier was 13.  She killed herself after her online crush – a 16 year old boy called Josh Evans said he hated her and the world would be a better place without her.

That would be bad enough, but Josh Evans in fact was 47 year old Lori Drew who set up the fake identity and said all those things to Mier as some sort of revenge for the fact Mier was no longer friends with her daughter. Drew knew Mier was on anti-depressants.
The full sad story is at the NY Times.