"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"
Advantages and drawbacks of data organisation in hierarchies, facets and with tags. Problems with finding the needed data without exact knowledge about it.
"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."
Ein englischer Text von Adam Mathes mit den Themen:The Creation of Metadata, Tagging Content in Del.icio.us and Flickr, From Tags to Folksonomy, Why Folksonomies Work and Areas For Further Research
C. Wartena. Research and Advanced Technology for Digital Libraries, volume 6273 of Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2010)