Members of the site each have a user profile and can upload research output including papers, data, chapters, negative results, patents, research proposals, methods, presentations, and software source code. Users may also follow the activities of other users and engage in discussions with them.
Here is the official word from Microsoft TechNet, The C:\Users folder is shared when any sub folders from C:\Users\<username>\ is shared. The article is stale and mostly unhelpful, but worth knowing to complete the story.
Choose the default Link Sharing setting. As a Google Apps administrator, you determine whether users can share their Drive files and folders outside your organization, plus the default link sharing option for new Docs, Sheets, Slides, and My Maps that your users create.elect the default Link Sharing option for new files created by your users. This setting determines how visible files are to other people. Users can override the default Link Sharing setting for any individual file, though they can never share outside the organization if you disallow that as described above.