Traditional media sources have adopted Twitter as a canal to broadcast information across digital audiences. This study has the objective of analyzing the characteristics of the tweets published by Spanish media sources during the twelve months in which presidential electoral processes took place. This was done to test the differences in the use of this platform, according to the content of the coverage, and the phase in which it was published. Our research uses a quantitative methodology, where we used computerized content analysis for Twitter publications that different media made during 2015 and 2016. Our results revealed a promotional use of tools such as the hashtag, or mentions in media with less followers. At the same time, political information was characterized by containing a higher use of mentions and statements by the candidates, especially during the election campaigning, favoring the creation of echo chambers in the political Twittersphere.