The UN's Guiding Principles on Business and Human Rights directs companies to engage with "rights holders" on human rights issues as part of their due diligence. That sounds straightforward enough, but for tech companies like Google and Facebook that have billions of users, it's not so simple. Every single user is a rights holder, since their human rights could be at risk simply by using the product...That's the quandary discussed in a new paper written by the nonprofit sustainable business network BSR and funded by Microsoft’s Technology and Human Rights Center.