We're very happy with y'all here in Texas.
I hasten to add that "y'all" is clearly not used exclusively by Texans.
edit also, if there's a possessive it gets pretty crazy, for example a tour guide, assembling several groups for a tour might say "Let's get together for alls y'all's tour".
"All y'all come by for supper" meaning you and your close family. And maybe even some other people as well, if there's room at the table for them.
47% of Australians are functionally illiterate - http://www.abc.net.au/local/videos/2012/09/07/3585457.htm
Illiteracy in Texas (still ranked #1 in US?) - http://www.literacytexas.org/literacy_in_texas/facts_statist...