Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Structure of Collaborative Tagging Systems   Collaborative tagging describes the process by which many users add metadata
in the form of keywords to shared content. Recently, collaborative tagging has
grown in popularity on the web, on sites that allow users to tag bookmarks,
photographs and other content. In this paper we analyze the structure of
collaborative tagging systems as well as their dynamical aspects. Specifically,
we discovered regularities in user activity, tag frequencies, kinds of tags
used, bursts of popularity in bookmarking and a remarkable stability in the
relative proportions of tags within a given url. We also present a dynamical
model of collaborative tagging that predicts these stable patterns and relates
them to imitation and shared knowledge.

26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat