An excerpt from a post by Anil Dash:
“Fix your communities. Stop allowing and excusing destructive and pointless conversations to be the fuel for your business. Advertisers, hold sites accountable if your advertising appears next to this hateful stuff. Take accountability for this medium so we can save it from the vilification that it still faces in our culture. Because if your website is full of a**holes, it’s your fault. And if you have the power to fix it and don’t do something about it, you’re one of them.” – Anil Dash
I linked to Anil’s article once before, last year. Worth re-reading.