Comment by aragonite

In the preprint they write:

> ... we observe extreme inequality in attention distribution. The Gini coefficient of 0.89 places HN among the most unequal attention economies documented in the literature. For comparison, Zhu & Lerman (2016) reported Gini co-efficients of 0.68–0.86 across Twitter metrics. ... The bottom 80% of posts [on HN] receive less than 10% of total upvotes. (https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5910263)

This could probably be explained by HN's unique exposure mechanism. Every post starts on /newest and unless it gets picked up by the smaller group of users who browse /newest, it never reaches the front page where the main audience is. In most forums/subreddits by contrast a new post (unless it gets flagged as spam) usually gets some baseline exposure with the main audience before it sinks. On HN the main audience is downstream of an early gate and missing that gate is close to being effectively invisible. IMO this fact alone could probably explain why "attention inequality" seems more extreme on HN.