How so? If a girl posts a picture of her in her underwear on the internet and she gets ridiculed for it, how is that victim blaming? She did something stupid, she got teased about it, case closed.
What if someone finds a box of photos containing some of your children in their underwear and scan them and trade them around the internet? Not all photos online were intended that way by the person who took them. To assume this is very convenient to your argument but not realistic in the broader view of what is being discussed.
More to the point, you are misunderstanding the stage at which the girl is victimized; when she is ridiculed. You are definitively blaming the victim if you think it's her fault that people other than her traded the photo around for whatever purpose leads to the teasing.
But that is a different case all together. If she didn't publish those photos, okay. Then publishing her photos is definitely reprehensible, ridiculing her is reprehensible, and trading those photos... Is probably wrong, but has no direct consequences on her, so I wouldn't be this quick to judge. The probability that someone who knows her will find the photos on the internet is not very high, is it?
If it makes them kill themselves its definitely not teasing, but heavy bullying. In that case very large portion of the guilt should be on those doing the bullying!
But of course it's easier to blame 'those paedophiles on the internet' than 'my little innocent boy'