That's a ridiculous website. It has a hodgepodge of real greetings along with nonsensical, stupid phrases. It depends on what country you live in and where. In the USA you'll hear many different sayings, Bye Bye Bye Buhbye Bye Now See ya Laters Peace Alright Aight Ciao etc...

Unites States (In my opinion) Bye (Casual) Bye, Bye. (Casual) Good bye. (Casual) See you later (Less formal) Catch you later (very informal)

Bye, bye bye, good bye, see you, see you later, see you soon, until next time...mmm... cherio (for the english). It really doesn´t matter which one you use, they all mean the same. Formal...mm... Good bye, until next time, have a nice day.

We Japanese say"sayonara"(good-bye)"matane"(see you again)"ogenkide"(take care),"mataau hi made"(see you later),jya-ne(bye).

I have to agree with Maidhc, most of that list is plain stupid. "Kamsahamnidah" is not even a goodbye; it means thankyou. Aside from the standard farewells, "ciao", "cheers" are commonly used in Australia, as well as "hooroo" or "hooray"(not as a cheer) by older folk.