_online_supp_Online_Appendix – Supplemental material for Digital Technologies and Selective Exposure: How Choice and Filter Bubbles Shape News Media Exposure

Supplemental material, _online_supp_Online_Appendix for Digital Technologies and Selective Exposure: How Choice and Filter Bubbles Shape News Media Exposure by Ana S. Cardenal, Carlos Aguilar-Paredes, Carol Galais and Mario Pérez-Montoro in The International Journal of Press/Politics