A Netizen (a portmanteau of Internet and citizen) [also known as a cybercitizen] is a person actively involved in online communities. Netizens use the Internet to engage in activities of the extended social groups of the internetworks

(i.e., giving and receiving viewpoints, furnishing information, fostering the Internet as a intellectual and a social resource, and making choices for the self-assembled communities). …

That’s what’s wikipedia says