[Health information and social media: the doctor as a primary school teacher again].

While health information reaches an increasing proportion of the population through social media, there is no guarantee that the provided information is always either up-to-date or correct. Besides possessing know-how on the assessment of the quality of provided information, doctors are also obliged to offer health information wherever it is requested. It is important for doctors to be present in social media to evaluate and provide health information. This is associated with interesting ethical and judicial questions.