Only marginally related to Shirky but ... read this and ask yourself about every possible manifestation of your own online identity. Think about the parts you regard as private or expressions of your self. Then imagine what would or wouldn't happen to them after your death.
This is the go-to site on the subject. Digital Beyond also contemplates, interestingly, the value of online disclosures as sources for future research. We live in a world of millions on Mary Sillimans.