Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural Models of Human Social Interactions in Online Smart
  Communities: the Case of Region-based Journalists on Twitter   Ego networks have proved to be a valuable tool for understanding the
relationships that individuals establish with their peers, both in offline and
online social networks. Particularly interesting are the cognitive constraints
associated with the interactions between the ego and the members of their ego
network, which limit individuals to maintain meaningful interactions with no
more than 150 people, on average, and to arrange such relationships along
concentric circles of decreasing engagement. In this work, we focus on the ego
networks of journalists on Twitter, considering 17 different countries, and we
investigate whether they feature the same characteristics observed for other
relevant classes of Twitter users, like politicians and generic users. Our
findings are that journalists are generally more active and interact with more
people than generic users, regardless of their country. Their ego network
structure is very aligned with reference models derived in anthropology and
observed in general human ego networks. Remarkably, the similarity is even
higher than the one of politicians and generic users ego networks. This may
imply a greater cognitive involvement with Twitter for journalists than for
other user categories. From a dynamic perspective, journalists have stable
short-term relationships that do not change much over time. In the longer term,
though, ego networks can be pretty dynamic, especially in the innermost
circles. Moreover, the ego-alter ties of journalists are often
information-driven, as they are mediated by hashtags both at their inception
and during their lifetime. Finally, we observe that highly popular journalists
tend to engage with other journalists of similar popularity, and vice versa.
Journalist egos also tend to keep their popular colleagues in the more intimate
layers, hence allocating more cognitive resources for them.

7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th