Quotation from Facebook developers blog:
Starting this week, we are requiring every developer to verify his or her Facebook account to create new applications. This is the same quick process that users go through when they want to do things like upload large videos.
We’re taking this step to preserve the integrity of Facebook Platform, ensuring that every application is associated with a valid and real Facebook account.
You can verify your account by either confirming your mobile phone (http://www.facebook.com/confirmphone.php) or adding a credit card (https://secure.facebook.com/cards.php) to your account. Facebook will not charge your credit card if you add it to your account.
Let us know if you have any questions in the Developer Forum.