11 million, 12 million, 13 million, and so on. What do all these numbers have in common? They are each milestones that Blizzard Entertainment has announced at one point or another signifying the number of global subscribers to its massively multiplayer online role-playing game, World of Warcraft. Already the game sucks in an exorbitant amount of players and time, but now its going to expand just a little bit more with a WoW Armory application on Facebook.

For those that don’t play World of Warcraft (WoW), The Armory is a section of the WoW website that allows users to search for other players, view their equipment, achievements, talent points (how they customize their character’s skills), guilds, and a myriad of other things. Now, players will be able to see a good deal of this on Facebook.

Making use of the social graph, the app will allow players to select up to five WoW characters to follow. From here, they have the option to set what appears in their feed. This includes boss kills, achievements, obtaining new gear, and so on. Of course, if you are highly active in WoW, it would be courteous to pick and choose what you share wisely, lest you barrage your friends with spam.

As an added bonus, users are also capable of viewing other friends’ Armory feeds from the app itself (assuming they’ve installed it). Furthermore, you get to view their actual in-game characters – as well as your own – fully rendered out. You can even rotate and animate them.

On another, and quasi-social note, Blizzard has also created an Armory app, called the World of Warcraft Mobile Armory for the iPhone and iPod Touch as well. Granted, this doesn’t incorporate the whole social graph element, but it does allow you to show off your characters to your friends more directly (i.e. “Hey, check this out.”)

Within the app, players can view their characters, search through a database of items, see what equipment they have, and more. Some of the more useful features: incorporate the ability to check Blizzard news, view your guild calendar (to see when it is doing special events), see your guild ranking based on achievements, and even create new talent distributions for your character.

Frankly, this is a great addition to a great game. Be ready for breaking Facebook feed news when the Lich King goes down later this week!