Selective sharing of news items and the political position of news outlets

• Political media bias is an important concern. Measuring difficult. We present a novel measure based on the selective sharing of news items by politicians. new for political position outlets politicians’ items. Politicians predominantly share that are in line with their position, hence, one can infer from revealed preferences over apply our to twelve major German analyzing tweets Members Parliament (MPs) Twitter. For each outlet under consideration, we compute correlation between seven parties 19th Bundestag and MPs’ relative number Twitter referrals outlet. find three positioned left, two them right. Several robustness checks support results. also procedure nine USA right, five left spectrum.