Fig. 3: Average percentage of overlapping venues visited by each user and her social media friends.

a Average venue overlap with friends across distance thresholds (50–10,000 km). This panel shows how average venue overlap between travelers and their friends changes with increasing distance from home. Social media friendships are compared to three types of simulated friendships: geohash proximity, shared home country, and fully random. b Average venue overlap with friends across ten categories, for visits occurring at least 100 km from home. Average venue overlap across ten categories is shown for social media friends, compared with three types of simulated friendships: geohash proximity, shared home country, and fully random. c Average venue overlap with friends across ten categories, for visits occurring at least 1000 km from home. Average venue overlap across ten categories is shown for social media friends, compared with three types of simulated friendships: geohash proximity, shared home country, and fully random.