I have been hearing about this kickstarter initiative from Hollaback, a non-profit and movement to end harassment in public spaces, all day on the CBC.
In terms of positive design hacks to combat cyberviolence, this one is simple, elegant and effective due to its reliance on the best part of humanity. On Heartmob you can give support to the people who have been subjected to harassment or you can report your own harassment and get supported with practical measures as well as encouraging messages.
Lovely!