Individuals who have registered on a social networking site by completing the process involved, such as providing their name, an id (usually an email address), and a password, as well as answering a few questions (date of birth, gender, etc.) are referred to as

Users or members

Explanation:

Whenever we register on a social networking site by completing the process involved, such as providing their name, an ID (usually an email address), and a password, as well as answering a few questions (date of birth, gender, etc.) we become users or members of that social networking site.

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