They are giving away beta keys via a sweepstakes so here is the info you need to get started for this.

First quote is the simplified info needed. Second quote is by the D3 community manager.


Quote Originally Posted by Duggy
Diablo III Facebook Sweepstakes

Q. Do I need a Facebook account to enter this promotion?
A. No. While entering with a Facebook account will provide you with some additional benefits, such as sharing if you've won with your friends, you don't need an account to participate. If you'd like to enter, but don’t have a Facebook account (and don't want one), you can click on the "Alternate Method of Entry" link at the bottom of the official rules page: https://apps.facebook.com/diabloiiib...s/159910/rules
Quote Originally Posted by http://us.battle.net/d3/en/forum/topic/3595370084
Lylirra
Community Manager
Hey everyone!

We've noticed there's been a bit of confusion surrounding the Diablo III Beta Key Sweepstakes, specifically in terms of how each winner will be notified and eventually granted access into the beta. To help clear things up, we wanted to quickly clarify how that whole process works.

While players who are selected through the official opt-in will have their Battle.net accounts automatically flagged for beta access, the same will not occur for the winners of the Facebook sweepstakes. Instead, sweepstakes winners will receive their Diablo III beta key via email from BlizzardContest@blizzard.com, and they will then need to activate that key through Battle.net by completing the following steps:
1) Log into Battle.net Account Management (https://us.battle.net/account/management/)
2) Select "Add or Upgrade a Game" from the "Games & Codes" drop-down
3) Under "Activate a Game Key," enter the key code into the provided box and click "Activate Game"
If the beta key is valid, the Diablo III beta will be added to the selected Battle.net account and can be downloaded here: https://us.battle.net/account/management/download/


For more information about the Diablo III Beta Sweepstakes, be sure to check out the official entry page and FAQ:
Official page - http://www.facebook.com/Diablo?sk=app_6009294086
FAQ - http://us.battle.net/d3/en/forum/topic/3342018236