It looks like lot of Facebook users have deleted (or are in the process of deleting) their Facebook profiles due to the recent uproar over Facebook’s new privacy policies.
Facebook has since then reverted to the old terms of service but that may not have prevented exodus so they now also show a "we are sorry" message to anyone who tries to erase his or her Facebook account.
The highlighted text reads:
Are you deleting because you are concerned about Facebook’s Terms of Service? This was a mistake that we have now corrected. You own the information you put on Facebook and you control what happens to it. We are sorry for the confusion.