Sentence:  Devices now track and record our every move and, whether we like it or not, each one of us will bequeath to posterity a virtual <WSD>avatar</WSD>, a digital being whose calls, messages, transactions, loves and losses will live on in a vast, unregulated cyberspace. The afterlife has arrived, at least for our cyberbeings. 
Meaning of the word marked with <WSD> tags:  A digital representation of a person or being; often, it can take on any of various forms, as a participant chooses. e.g. 3D, animated, photo, sketch of a person or a person's alter ego, sometimes used in a virtual world or virtual chat room.