Ask a friend to come here. You'll see a shadow of their mouse moving around:
Move near it. A menu will appear: you can ask to talk to them, or just see who they are.
As simple as that, you can interact with others browsing the page. Visitors can discuss content, ask questions, or simply feel they're in the right place - after all, it's popular isn't it?
If no one else is here, here's a video of what you'd see if another person came: