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Web single-sign-on (SSO) is a mechanism that enables a user to login to the systems once and allows the user to access all authorized computer resources without the need to reenter the authentication information in each application. One example of web SSO mechanism is through the use of social media credentials. This paper presents an experimental study that aimed to investigate whether the SSO mechanism provides better usability compared to traditional authentication method. This study revealed significant results where web SSO through social media credentials had better usability compared to traditional login for accessing teaching materials. It demonstrates the evidence to guide future web development particularly for designing authentication in a course web site.