Why don't people like Facebook auth?

I don't use Facebook because of my privacy concerns; in fact, a lot of people do.

For me I can't use Facebook auth because I don't nor plan to have a Facebook. I do have a twitter and regularly use them to login to websites. 1 click signup is very convenient but some people just don't want to sign up for Facebook.

Lots of people just don't use facebook and they are not going to start just to use your app. Also I've learned that everyone I know who has scew you money, doesn't use facebook.

I don't use facebook and I feel a little affronted when people expect me to sign up for an account just to use whatever random thing it is they hope I'll try. You're not important enough.

Even when I did have a facebook account I wouldn't have been comfortable using it to log in to other services, because you never know what information Facebook is going to mine out of anything you give it access to.

2) for me. I haven't logged into FB in 2 years and use Ghostery and Disconnect to block tracking widgets. Sure, offer it to people who want it, but many of us would trade the convenience for the control over our login credentials.

It's not just you. I wouldn't create a Medium account yesterday because Ev Matthews wants me to sign in using Twitter. I hate Twitter, why would you want to restrict yourself that way?

Gotcha, it sounds like those 2 are indeed the reasons - and many people feel quite strongly about it. So twitter/other might be a so-so alternative convenience, but password is a vital alternative

Facebook constantly bothers me. I've opted out of every possible form of communication from them. They still send me updates on profiles I don't care about, friend suggestions I have ignored 10x over, and "We're sorry you have been having trouble logging into Facebook" messages.

I can log in just fine, I just don't want to and your constant pestering is only making things worse. I'm also against the concept of single sign on. Users constantly forget their passwords and have their accounts compromised.

The last thing you need is to lose access to things you've paid for because someone hijacked your Facebook account.

I'm reluctant to use Facebook auth on new apps for two other reasons:

1. I don't know at the time what you want to use my information for, especially in regards to showing up on my or, more importantly, my friends' news feeds.

2. I have to manage what information I share on Facebook itself rather than on the app or website.

We are not regular people. We know about the potential security issues. We want to be in full control of our own data. Just give us an outlet. Create an email sign up method for the noisy minority.

Foursquare shows a nice way to do it: https://foursquare.com/signup/ though hopefully you don't need as much data as them.

In my experience most people will still choose FB login if you make it the prominent choice, and the email sign up will capture us whiners.

More of an "ick" factor than anything, I have a dummy Facebook account (I jumped that ship years ago) that I keep just for that sort of thing but I feel dirty using it.

Not everybody thinks Facebook is creepy but their brains do, I don't think it's a good idea to stir those creepy feelings in your user's subconscious and risk having them projected at you, if you can avoid it.

facebook is too creepy for me. i don't post statuses or any photos anymore, nor i message with others due to privacy concerns. I never use auth with facebook

Facebook is doing weird things. I get promoted posts from Amazon. They say "$Name Liked Amazon" - well, I knew that the first time the promoted post told me. I still know it now. And it's weird that the promoted post keeps telling me. I don't want promoted posts spamming my friend's timeline (or whatever the heck I'm supposed to call it this month) telling them that I liked some page (which I probably did years ago and have forgotten about).

And I genuinely have no idea i) what you can do to my timeline or ii) what information you get about me from FB.

I use facebook, but do not EVER use FB authentication. I've been burned in the past, like I suspect most of your detractors have. By authenticating using FB, I'm not just signing up with a website and giving them my own details, but potentially giving up the details of friends, access to post information as myself, the ability to read my information, etc. I will authenticate using Google, Github, Twitter, and other services, just not FB, ever again. I've removed all "apps", no longer like corporate pages, never "connect" it to a website or application, etc. Even my friends who are not technologically literate refuse to do it.