Interesting examples, terrible argument! No substantiated claims whatsoever! Shirky obviously thinks he is pretty smart and does not have to produce any real arguments based on evidence.
"They are built to be human-usable (...) are targeted primarily for storage/retrieval of personal information and serendipitous discovery of group information . (...) The development communities for each are abuzz with ideas for exploiting the structure"
"by letting users tag (...), we're (building) systems that, like the Web itself, do a better job of letting individuals create value for one another, often without realizing it."
C. Damme, M. Hepp, и K. Siorpaes. In Proceedings of the ESWC Workshop ``Bridging the Gap between Semantic
Web and Web 2.0'' (SemNet 2007), стр. 57--70. (2007)
H. Kim, S. Scerri, J. Breslin, S. Decker, и H. Kim. DCMI '08: Proceedings of the 2008 International Conference on Dublin Core and Metadata Applications, стр. 128--137. Dublin Core Metadata Initiative, (2008)