If you are a programmer then usually your proof of work is spread across multiple sites like github, gitlab, your own sites, blogs, coding challenge sites, stackoverflow etc., Which of these links would you put on your resume? Why not all? Or just your ‘One Address’. It shows that it is really your work.If you are a celebrity then you might be on 1 or many social networks. You will definitely find a lot of fan or fake pages created with your picture and name. Your image gets affected by what is done on those accounts. You can easily create accounts of your own and link them all here and use it as a Digital Index Page.