Please don't force me to log in with facebook
I was rather interested in Denso, until this happened. I chose to sign up using a separate username and password, only to find out when adding a video about a week ago that I just can’t log in anymore. No word of warning. They just yanked the ability to log in with a username and password.
I have facebook but I usually refuse to use it, especially for an unrelated service. For one, I don’t want to worry about what permissions your app has (“basic” permissions includes my friends list, which is something your app shouldn’t require at all), and I don’t really trust facebook and their frequent change in policies.
Even if you’re not going to have your own authentication system (I think you should), at least give me a few options.