Somewhere in the back of our minds, we all know that we are going to die. Even further back in our minds, we have a vague understanding that death could happen to us at any moment, though millions of moments have been spent and we are still breathing.
Human beings are social animals. That means we are never alone even if we are. Contemporary sociologists raise the idea of individualization arguing modern social institutions prompt people to be independent and self-determining individuals who take responsibility for their own life choices. However, this is not necessarily contradicted to 'strong ties' individuals have built through their lives. There are always people who care about you, help you and wish you all the best. Therefore one's death could possibly mean so much for his or her social connections who constitute one's memories.
Through the lens of 'looking-glass self' theory, a social psychological theory arguing that a person's self grows out of society's interpersonal interactions and the perceptions of others, we learn that what makes us 'us' could possibly be constructed by others: our families, friends, acquaintance, etc. So it is assumed that one's life could be re-present by his or her social network.
Remember the first time you met he or she? What is your first impression on him? What events you have been together? What have you learned from this person? If you could summarize his or her personalities in three words, what would it be? What makes you admire or have respect for this person? ... Why don't we record our thoughts on this person and keep it in Pensieve?