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Directories: A databank of various sites, categorised into different genre`s usually maintained by a human editor.

Doorway page: A page usually outside the navigational structure of the parent site. A link that spells a particular keyword but redirects you to an irrelevant page all-together.

Double opt-in - Many times, users subscribe to online services by giving their email addresses on a web page. Then, they also confirm their subscription after receiving an email in their mentioned address. This process authenticates the user's id for the mailing software of that website.

Double opt-out - It is the same as opt-in, but used for unsubscribing from mailers. This option is made impossible by a few spam operators who simply do not allow users to opt out of mailing processes.

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