Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identification and modeling of discoverers in online social systems   The dynamics of individuals is of essential importance for understanding the
evolution of social systems. Most existing models assume that individuals in
diverse systems, ranging from social networks to e-commerce, all tend to what
is already popular. We develop an analytical time-aware framework which shows
that when individuals make choices -- which item to buy, for example -- in
online social systems, a small fraction of them is consistently successful in
discovering popular items long before they actually become popular. We argue
that these users, whom we refer to as discoverers, are fundamentally different
from the previously known opinion leaders, influentials, and innovators. We use
the proposed framework to demonstrate that discoverers are present in a wide
range of systems. Once identified, they can be used to predict the future
success of items. We propose a network model which reproduces the discovery
patterns observed in the real data. Furthermore, data produced by the model
pose a fundamental challenge to classical ranking algorithms which neglect the
time of link creation and thus fail to discriminate between discoverers and
ordinary users in the data. Our results open the door to qualitative and
quantitative study of fine temporal patterns in social systems and have
far-reaching implications for network modeling and algorithm design.

35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an