We analyzed the production routines of Cordoba's most influential journalists on Twitter during the municipal elections in Córdoba, Argentina on September 2011 in order to understand newsworthiness criteria, modes of gatekeeping and specific characteristics that separate the non-professional user from the journalist. By applying the virtual ethnography method and a semi-structured survey to a sample of 45 professionals, we concluded that Twitter reflects some features of conventional media information production routines, albeit within the frame of distinctive appropriations, as behaviors of self-promotion and self-reference, greater informality and also an interaction primarily implemented between colleagues.