Hook-up culture has always existed as well, but let's not pretend that Tinder hasn't changed the pace/availability of hooking up. In the same light, let's not pretend that the anonymity of the internet hasn't facilitated people comitting adultery.
In the same light, let's not pretend that the anonymity of the Internet hasn't facilitated people engaging in terrorist activity and drug trade. When do we build the firewall, captain?
We build the firewall around prosocial behavior. I think that if the names of all of the coke dealers selling their wares through TSR came out today I would not be upset either, because it's a scummy, exploitative industry. If you're breaking a social contract, my expectation of other people upholding their social contracts with you, in that area, are very slim.
Public exposure of individuals' private information is irresponsible, period.
Vigilantism is against the social contract, upholding it implies you gave up that power to the institutions that have the responsibility to judge and prosecute.