You might click on a link to read a newspaper or magazine or website article and it asks you to create an account to be able to read it fully. Just enter the supplied user name and password and off you go. All of the usernames and passwords listed on BugMeNot are added by users which obviously has its good and bad points. Good in that people can quickly add logins they have newly created themselves or found, bad if somebody is intentionally being mischievous and inserting fake information.
BugMeNot - Wikipedia
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BugMeNot is an Internet service that provides usernames and passwords to let Internet users bypass mandatory free registration on websites. It was started in August by an anonymous person, later revealed to be Guy King,  and allowed Internet users to access websites that have registration walls for instance, that of The New York Times with the requirement of compulsory registration. This came in response to the increasing number of websites that request such registration, which many Internet users find to be an annoyance and a potential source of spam e-mail. BugMeNot allows users of their service to add new accounts for sites with free registration. It also encourages users to use disposable email address services to create such accounts.