OSEM (Online Selective Exposure Measurement) for SoSci is a collection of scripts that help you conduct mock website selection expirements with the questionnaire software SoSciSurvey.
Download or clone all files to your hard drive, then consult the Wiki for detailed instructions.
Unkel, J. (2019). Measuring selective exposure in mock website experiments: A simple, free, and open-source solution. Communication Methods and Measures. Advance online publication. doi: 10.1080/19312458.2019.1708284