Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temporal influence over the Last.fm social network   Several recent results show the influence of social contacts to spread
certain properties over the network, but others question the methodology of
these experiments by proposing that the measured effects may be due to
homophily or a shared environment. In this paper we justify the existence of
the social influence by considering the temporal behavior of Last.fm users. In
order to clearly distinguish between friends sharing the same interest,
especially since Last.fm recommends friends based on similarity of taste, we
separated the timeless effect of similar taste from the temporal impulses of
immediately listening to the same artist after a friend. We measured strong
increase of listening to a completely new artist in a few hours period after a
friend compared to non-friends representing a simple trend or external
influence. In our experiment to eliminate network independent elements of
taste, we improved collaborative filtering and trend based methods by blending
with simple time aware recommendations based on the influence of friends. Our
experiments are carried over the two-year "scrobble" history of 70,000 Last.fm
users.

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The categories of this paper are: hep-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc