During adolescence, the Internet is mainly used for purposes of socialization. Non-verbal elements limit online communication, thus leading to widespread use of emotional resources. It would be preferable if virtual interaction did not reduce the quality of person-to-person contacts, particularly thanks to the adoption of netiquette (respectful treatment of others online). Phubbing, the tendency to check one's mobile phone during a face-to-face conversation, has become a widespread practice that causes anxiety and can lead to social exclusion. Educating on this behavior could be related with emotional content and with netiquette. This study's objectives are to analyze the extent to which the use of netiquette and online emotional content are associated with and can predict phubbing, taking gender differences into account. 935 adolescents (ages 12-17, 55,1% female) from 13 schools in the region of Aragon (Spain) responded to our questionnaire. Results are revealing: the level of online emotional content increases the level of phubbing; online emotional expression is the most influential risk factor in both genders; netiquette protects girls to a greater degree. We discuss the educational challenges posed by guaranteeing the responsible use of social networks.