I don't like Gawker either. But seeing people praise this decision merely because Gawker sucks, while casually dismissing other concerns, including the serious First Amendment ramifications, makes me very uneasy.
The First Amendment doesn't give you free reign to say whatever you like whenever you like, and there are already limitations on the First Amendment with regards to things like obscenity and speech that appeals to prurient interests:
https://en.wikipedia.org/wiki/United_States_free_speech_exce...
Posting a private sex tape without permission is not likely to pass the Miller test: https://en.wikipedia.org/wiki/Miller_test
Distributing naked pictures of someone without their consent has never been legal. The fact that they were taken in the cameraman's home is no defense. This is no different than a frat boy putting a hidden camera in the frathouse bathroom before a party and then distributing pics of freshman girls with their pants down.
Which law prohibits it?
https://en.wikipedia.org/wiki/Privacy_laws_of_the_United_Sta...
http://www.criminaldefenselawyer.com/resources/revenge-porn-...
This is a good outcome in every possible respect.