aggregations. Moreover, Talaia is built using open source software with a strong academical background and tested against well known benchmarks. Talaia’s performance is thus, verifiable.

Data Collection {#isv2018:dc}
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The first step of a monitoring system such as Talaia is the collection of information. The Multi Source Monitor (MSM) system[^15] is currently able to monitor Twitter, syndication feeds and also multimedia sources such as television or radio programs. Support for other social media such as Youtube, Facebook, etc. is under development.

MSM is a keyword based crawler, which works on a set of keywords defined by the user. Rather than a list of unconnected terms, Talaia is designed to work over a hierarchy, which allows a better organization of the data for the analysis step. In this way, keywords are defined as belonging to a specific category in the taxonomy. One handicap of crawling using a keyword-based strategy is that it is often difficult to define unambiguous terms that do not capture noisy messages. In order to minimize this situation, MSM implements a number of features:

1.  [**Regular expressions**]{} are used to define keywords. This allows to differentiate between common words and proper names, or full words and affixes (e.g., 