June 13, 2012, 5:49 PM — Here's how you can change your preferred currency for payments on Facebook.
1. Login to your Facebook account.
2. Click the arrow drop down menu in the upper right corner of the Facebook web interface.
3. Go to Account Settings.
4. Click the Payments tab.
5. Click the Edit link next to Preferred Currency.
6. Select your preferred currency from the drop down menu, then click the Save Changes button.