What happened Megan Meier?

Charles, Missouri, U.S. Megan Taylor Meier (November 6, 1992 – October 17, 2006) was an American teenager who died by suicide by hanging herself three weeks before her 14th birthday.

What is the meaning of cyberbully?

: the act of bullying someone through electronic means (as by posting mean or threatening messages about the person online) cyberbullying.