[adultSwim]

I would assume users retain full rights to their comments. I wasn't aware I had agreed to anything else.

[JoeAltmaier]

No attempt to protect a copyright means no rights.

[eric_bullington]

Nope, you're thinking of trademarks. Your copyright exists at the exact moment you create a copyrighted work, and you needn't do anything else to retain that right [1].

1. http://web.law.columbia.edu/keep-your-copyrights/copyrights

[JoeAltmaier]

Right, thanks!

[brudgers]

[IANAL] Not in the United States. Here copyright is owned by the author upon publication with only narrow and explicit exceptions.

[tptacek]

That's true of every Berne Convention country; it is the norm.

[nness]

That is incorrect. You are thinking of trademarks and patents.