Since a dozen of years, there is a growing interest for so-called 'citizen sciences'. This may be viewed as just a new fashion or as a way to open science to society. This may also be viewed as the vector of uberisation of research and reduction of of citizens as collectors of data.
Taking a socio-historical perspective, this talk will argue that 'citizen sciences' are not totally new. The historical experience may help to identify conditions that are necessary for these approaches to contribute to the renewal of the contract between science and society.