Donnez votre français à la science ! (Give your French to Science!) Crowdsourcing and linguistic variation: presentation and first results. The crowdsourcing platform called Donnez Votre Français à la Science (DFS, i.e "Give your French to Science") aims at linguistic data collection and language documentation, with a special focus on regional variation in European French. Not only is the gathered data useful for scientific studies, but providing feedback to the general public is also important in order to reward participants, encourage them to follow upcoming surveys, and foster exchanges with the scientific community. The two main activities described here are 1. a linguistic survey on lexical variation with immediate feedback and 2. a speaker geolocalization system, i.e. a quiz that guesses the linguistic origin of the participant on the basis of his/her answers compared to previously gathered linguistic data.