When it comes to linguistic norms in France, one standard will be immediately evoked – le bon usage. This version of traditional French is taught at school and has been serving as a model ever since the French Revolution. Yet – and maybe as a counter-reaction to such strict and prescriptive norm – there exists a multitude of alternative forms, especially with regard to the lexis, which are marked by different registers or styles. Thus, the French language is characterized by lexical doublets in the transition area between standard and familier. A varied terminology in the description of styles in dictionaries as well as a stigmatisation of the nonstandard lead to speaker insecurities and to a general devaluation of the parallel vocabulary. What are the consequences of this in speech behaviour? Is there a remarkable difference between speech behaviour and prescriptive norm? Do speakers show any sign of linguistic insecurity when using nonstandard structures? The research issue will be addressed by means of a qualitative analysis of videoblogs from French YouTubers.