Online Social Networks play a leading role in news consumption. As a
consequence, most newspapers and other media use these platforms to promote
their content. However, the geographic bias in the media, in addition to the
demographic bias in Online Social Networks can lead to inaccurate and
incomplete view of the news in a country. Being aware of these two kinds of
bias in news published in Online Social Networks is useful to understand the
context in which events develop. We selected Chile as a case study to observe
these problems. Chile is a country with a high degree of participation in
Online Social Networks and suffers from both issues: media covers mostly news
from Santiago, its capital, and most of Online Social Networks users are
located in this city. We built a dataset of Chilean news headlines extracted
from Twitter. We conducted a characterization of news and messages which
comment them. We focus on the geographical and temporal features of news. In
this paper we present the results of this analysis in addition to the
description of the dataset. Our findings show that as expected, news and
Twitter users are mainly concentrated in Chile's capital. In addition, users in
Chile focus on local news paying little attention to international events. We
observed that a considerable number of users discussing Chilean news are
located outside of Chile. We conclude that users in Chile are subject to bias
in news media coverage of information, which privileges news from the largest
cities.