I've grown to seriously hate OAuth as a login mechanism. It's great for connecting accounts for integration, but I've been burned by it as a login.
On one of my previous projects, Twitter was the only allowed login method. After some complaints, we implemented an email-based login and reduced the bounce rate by over 50%.
Another anecdote: whenever my Asana session expires, I always struggle to remember which Google account I registered with or if I used email. The worst part of their flow is that if you're wrong, a new account is created and you login to a blank slate. It takes forever to find the log out button to try again too.
On one of my previous projects, Twitter was the only allowed login method. After some complaints, we implemented an email-based login and reduced the bounce rate by over 50%.
Another anecdote: whenever my Asana session expires, I always struggle to remember which Google account I registered with or if I used email. The worst part of their flow is that if you're wrong, a new account is created and you login to a blank slate. It takes forever to find the log out button to try again too.