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…er to solve multiple log-in problem you should keep users logged in until they explicitly sign out. The less people need to log in, the fewer sign-in problems you’ll have.
…he overall user experience smoother. Rather than having a ‘Keep me signed in’ option it’s better to automatically keep users logged in to a site or app.
Takeaway: Use multiple options for login (Phone, email or user name), rather than just username.