How does this differ from http://futureme.org http://futureme.org ? I used that service in the past to send myself a message from me pre-PhD-completion self to

How does this differ from http://futureme.org http://futureme.org ? I used that service in the past to send myself a message from me pre-PhD-completion self to my post-PhD-completion self to ask how it was. Although it was basically procrastination at the time it was surprising and strangely cathartic to receive an email from a very different sounding me.