(1) a cyberghost is when the information of someone known to be dead still exists on the internet.
(2) a person who never really existed, but was made by someone else, and exists only on the internet.
(3) verb. to cyberghost: to create someone, or a profile of someone on the internet who is dead or never existed.

The act of having no contact through technology. Disappearing from social networks, text, emails, etc.. for a period of time