It's Google's proposal, but it actually affects any entity having multiple domains. Think of publishers like Conde who have multiple magazines, or a company wi

It's Google's proposal, but it actually affects any entity having multiple domains. Think of publishers like Conde who have multiple magazines, or a company with regional domains (company.co.uk, company.com) or a content site set up for specific company-driven event (thecoolshow.com)... All of these would enable the entity to manage user experiences better, instead of having to do hacks, multiple logins, or other user hassles.