about their evaluation approach.
In the second area, only few works analyze the originators
of incident related information in microblogs. Vieweg et al.
(2010) examine communication on Twitter during two large
scale incidents (Oklahoma Grassfires and the Red River
Floods that occurred in March and April 2009). They describe
that 49% to 56% of all tweets related to the incidents
contain situational update information. It remains unclear,
which types of users share this information. Starbird
et al. (2010) also analyze tweets shared during the Red River
Floods. They show that individuals comprise 37% of all
tweets. On the other side, only about 3% are flood specific
organizations, but they share more than 44% of the tweets.
As a result they conclude that mostly governmental agencies
share situational information, though, this information
can further be enhanced with insights from citizens. Despite
crisis related scenarios, Choudhury et al. (2012) conducted
a detailed analysis of user behavior during rather common
events. They show that individuals share a lot of information
during local events. Organizations or journalists share
more information during national events or breaking news.
Summarized, related work shows that the behavior of users
during events seems to differ depending on the type of event.
Furthermore, the user behavior during small scale incidents
has not been evaluated so far.