The phrase "idea from a shower" caught my eye and in very little time I could see myself brain-storming ideas on paper. I like one idea which uses XFN links and FOAF. But are they popular enough to base an idea on them? Is is possible to urge people to describe their relations with XFN and FOAF by adding it in the plugin that I develop?

To be precise, my idea isn't new. It's just what other few startups are doing. But in a different way: by utilizing these XFN and FOAF data.