> the mobile version of GTalk uses a proprietary protocol That's a really irrelevant point to standards. With that logic you could argue that Opera Mini isn't

> the mobile version of GTalk uses a proprietary protocol That's a really irrelevant point to standards. With that logic you could argue that Opera Mini isn't a web browser because Opera servers download the HTML and convert it to a proprietary format for display on the device. Or that Bitlbee doesn't adhere to XMPP because users communicate to a Bitlbee server through an IRC client.