中文摘要
我们研究网络搜索个性化对搜索结果中意识形态隔离的影响。我们在美国 25 个城市部署了 150 名具有随机化党派浏览偏好的合成互联网用户。这些用户在 2020 年美国大选及其后续时期保持活跃。在每日实验中，这些用户输入相同的选举相关查询；结果为不同党派倾向地区之间搜索结果存在意识形态隔离提供了有力证据，但对于同一地区内具有不同党派浏览习惯的用户之间存在意识形态隔离，仅提供了有限的证据。我们讨论了全国与地方（线上）媒体格局对于理解这些结果的重要作用。（JEL D72, D83, L82, L86）
Abstract
We study the impact of web search personalization on ideological segregation in search results. We deploy 150 synthetic internet users with randomized partisan browsing preferences across 25 US cities. These users are active during the US 2020 election and its aftermath. Daily experiments in which the users enter identical election-related queries provide strong evidence for ideological segregation in search results across locations with different partisan leanings but only limited evidence for ideological segregation within location across users with different partisan browsing habits. We discuss the important role of the national and local (online) media landscape for understanding these results. (JEL D72, D83, L82, L86)