21st century. When you connect with someone on Facebook or LinkedIn or follow someone on Twitter or Instagram, you are casting out yet another edge in a gigantic graph. Maybe genealogy is not your thing and you prefer music, or books, or knitting? Don’t worry, there’s a graph for all of those too where you can connect with people of the same interests and share your passion and knowledge. If you are stuck in a traffic jam and your car is at a standstill, you may be contributing to the value of an edge o