This article in the Harvard Business Review describes CoursePeer, a platform for professors to

  • interact with students while they take a course
  • rate the interactions in a manner akin to liking or not liking a student's contributions

The article points out that CoursePeer has made these ratings exportable so they can be communicated directly to employers, providing a more accurate, multi-dimensional assessment of each student than is provided by class grades and grade point averages. From experience, I know that companies would pay handsomely for access to these ratings, and ultimately for access to top students. What's not clear is how to divert a significant share of this revenue stream to K-12 for its role in preparing top students.