Netflix, HULU and Amazon Prime do not allow AdBlock Plus. Whenever I have AdBlock Plus enabled, the video I'm watching will not load and a messages appears that says something to the effect: "Hulu is supported by advertisers. To further enjoy HULU or HULU Plus, please deactivate or uninstall your adblocking software." I get similar messages in Amazon Prime and Netflix.
You whitelist those sites where you don't want your adblocker to run.
Ghostery actually calls it Whitelist in it's drop down.
I use AdBlock (the original) vs the newcomer AdBlock Plus. In it's drop down, you merely select the option to either not block that page or the entire domain.