Idea/definition: a “single persona zone” on the internet is all the places / sites where you’d like to be known as the same persona, use the same attributes, avatar etc.
You can use many of those and keep them separate, such as personal vs work. The new idea here is its more natural to think about this single persona zone than how to refer to accounts on other sites as “me, too”.
Note that in most cases, a single persona zone is much larger than a single website.
Example for a “single persona zone”: your job searching persona zone might include your LinkedIn, your GitHub, your personal website that has a resume in html and pdf, all accounts on job searching sites that you use for this job search, and the accounts on networking/event sites like Meetup where you rsvp for networking events.