I don't know what "deactivating" does, but the account is reactivated if you log in. I tried it and it didn't appear to do anything except log me out. I also sent an email to privacy@quora.com to have the account deleted, but it hasn't happened yet...
No. You have to send a mail to privacy@quora.com and they might take mercy on your asocial soul and delete your account for good (no guarantees though).
Could you give more info/insight on what your app exactly do in the end? I really don't feel comfortable using my facebook account just to test something and give feedback as I'm seeing in most of Show HN posts.
The app helps you create beautiful wedding invites. A lot of people create FB events or send emails for this scenario which I dont think is befitting for an occasion like a wedding.
As far as FB login is concerned, you will notice I ask no permissions(not even email) when you login and grant permissions through Facebook. This means that the app really can't do anything.
dummyimage is in fact made by one of the same guys, which makes the whole exercise confusing, because they appear to have the same interface but with different themes for their marketing.
Futures/Promises are an interesting technique to do control flow. IMO, there are certain nuances like losing distinction between async/sync calls that work against the technique. I wrote an article about it at: http://javascriptturnsmeon.com/93769736