Adrian Chan writes:
... Folksonomic participation sites like digg.com, del.icio.us, and technorati.com seek to create value by aggregating individual participation. Not, in other words, through member to member communication. What one person finds interesting, when she adds it to a tagging site, contributes to shared community knowledge. The more other users submit the same interest and site, and possibly tag identification, the more this loose social system can produce "knowledge." So goes the idea. ¶ There’s no disputing that value is added during social participation, but there is some debate around what that value is, not to mention how to measure it.