Rubhub is a lookup engine for determining the relationships between people who author personal websites. The relationships are based on XFN, the first offering of the Global Multimedia Protocols Group (GMPG).
I want to talk about what I now think is one of the core challenges for designing large-scale social software. Let me offer a definition of social software, because it's a term that's still fairly amorphous. My definition is fairly simple: It's software t
Taggound is a social search engine mashup. What does that mean? Tagground searches various social web applications (ex. yahoo my web 2.0, del.icio.us, raw sugar, flickr, You Tube etc) repositories to retrieve relational data (ie tags, urls) that other use