Friendship paradox biases perceptions in directed networks
Friendship paradox biases perceptions in directed networks
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DOI：
10.1038/s41467-020-14394-x
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发表时间：
2020-02-05
影响因子：
16.6
通讯作者：
Lerman, Kristina
中科院分区：
文献类型：
--
作者：
Alipourfard, Nazanin;Nettasinghe, Buddhika;Lerman, Kristina
Social networks shape perceptions by exposing people to the actions and opinions of their peers. However, the perceived popularity of a trait or an opinion may be very different from its actual popularity. We attribute this perception bias to friendship paradox and identify conditions under which it appears. We validate the findings empirically using Twitter data. Within posts made by users in our sample, we identify topics that appear more often within users' social feeds than they do globally among all posts. We also present a polling algorithm that leverages the friendship paradox to obtain a statistically efficient estimate of a topic's global prevalence from biased individual perceptions. We characterize the polling estimate and validate it through synthetic polling experiments on Twitter data. Our paper elucidates the non-intuitive ways in which the structure of directed networks can distort perceptions and presents approaches to mitigate this bias.
