Task: Question Answering
Input (English): We find that communities that are characterized by specialized, constantly-updating content have higher user retention rates, but also exhibit larger linguistic gaps that separate newcomers from established members. More closely examining factors that could contribute to this linguistic gap, we find that especially within distinctive communities, established users have an increased propensity to engage with the community's specialized content, compared to newcomers (Section SECREF5 ).  
 Question: What patterns do they observe about how user engagement varies with the characteristics of a community?
Output (English): communities that are characterized by specialized, constantly-updating content have higher user retention rates, but also exhibit larger linguistic gaps that separate newcomers from established members within distinctive communities, established users have an increased propensity to engage with the community's specialized content, compared to newcomers