I have been to a number of sites that I want to try out but give up when they force me to log in with 'connect with ' facebook. I know most people have it, but some don't. I don't.
You should really have your own authentication in my opinion, but if you insist on not, at least give me a few options.
Imagine you get a lengthy help description which then you pipe to less.. and you only get (END) in your terminal. Turns out the author decided to print help message to stderr instead of stdout. I assume newcomers will be as confused as I was when it happened to me for the first time. GNU utils use stdout for help texts, and so should you.
You should really have your own authentication in my opinion, but if you insist on not, at least give me a few options.