For an example, you can go to my page on occam’s razor and scroll to the bottom to see all the backlinks to that page (i.e. all the places where I link to occam’s razor).
This prototypes a possible way to link between different people’s knowledge graphs using the familiar structure of URLs. This relates to the idea of a world knowledge graph, and I discuss it more in my post on how logseq should build a world knowledge graph.