Opt for emails and phone numbers instead of usernames

Social network apps often ask users to create a unique username as they help users identify themselves among others. Beyond that, are usernames necessary at all? Login/signup forms that ask for a username create an extra cognitive load, forcing users to create and remember their usernames for their subsequent sessions.

Provide alternative ways to log in using their emails or phone numbers. These are easier to remember. Plus, logging in or signing up with an email address is more secure because it's usually not seen by other app users, reducing the chance of an account being hacked.