I have posted two pictures here because it was hard for me to sum up immortality in one image. So please just pick one image that relates to your view and give your thoughts.

Your topic has resonance with mine. I've come across five different types of immortality in various mythologies and science fiction:

• Literal or physical: because science seeks to make it so. I just hope they wait for some better stock to evolve before that happens.

• Spiritual: including often eternal afterlives. Flying, decapitated baby heads make me want to go to Heaven.

• Data: existence with a binary processor would be extremely slow. This one might take off along with organic computing.

• Reincarnation or the lifestream theory: when you die a part of your energy might be resurrected as a Sudanese person. Don't worry, it won't be long before part of that part of you becomes part of something else.

• Biological inevitability: Life feeds on life and we all know it. If you cut me open you won't find a soul, but in feasting on the flesh of other life we assimilate DNA, the data of our very being. Our body deconstructs proteins and reconstucts them to fit our own DNA. Between the different bases (A, T, C, G) there are three billion unique chemical compounds in the human race alone, and that doesn't include the genes which reside in our power cores, Mitochonria.

• Social: You can't live forever, but you can sure change the world in a way that makes people remember you after death. Viva Blake, Viva Che, Viva Leary. Sorry, Ozymandias.

So, there's lots of exigence there. I think you've got something good going on with your definition so far, but it is so far lacking currency. Why do we care what immortality is? What are the implications of the different types of immortality? How did they come to be? How has social immortality changed in the last 300 years and typically what kinds of people are socially immortal anyway?