I've published my latest free article which shows in detail how to set up social login using Twitter for your Bubble app.
https://bubblebuilder.substack.com/p/how-to-enable-social-login-using-06f
People are tired of managing passwords. I know I am. I have a password management system which works well, but sometimes I just want to click Signup with Twitter, and not think too much more about it. Of course, every bit of convenience is trading away a little privacy, but most people are used to this trade off by now, and not having to think of a password is a little bit less friction in your new customer sign up flow.