Résumé
Thousands of texts daily published on the Internet indicate practices, attitudes and opinions on plenty of issues, politics included. They can be considered a real material to analyze the social world. These digital texts are quite specific, with regard to other types of data: they are not generated by and for a research protocol. Therefore, the researcher ignores the sociological properties of their authors. In order to identify these authors in the real social world, I built my own methodological plans to panelize the members of the social network Twitter. The data generated by my method support the following idea: the individuals who publish political texts are politicized and have high cultural capital. Besides, they only do so on an occasional basis. The level of production of political tweets is in fact correlated to the level of activity of the field of production of information and opinion. Twitter can therefore be considered a monitoring tool of the political opinion market.