The increased social media attention to scholarly articles has resulted in creation of platforms & services to track the social media transactions around them. Altmetric.com and PlumX are two such popular altmetric aggregators. Scholarly articles get mentions in different social platforms (such as Twitter, Blog, Facebook) and academic social networks (such as Mendeley, Academia and ResearchGate). The aggregators track activity and events in social media and academic social networks and provide the coverage and transaction data to researchers for various purposes. Some previous studies have compared different altmetric aggregators and found differences in the coverage and mentions captured by them. This paper attempts to revisit the question by doing a large-scale analysis of altmetric mentions captured by the two aggregators, for a set 1,785,149 publication records from Web of Science. Results obtained show that PlumX tracks more altmetric sources and captures altmetric events for a larger number of articles as compared to Altmetric.com. However, the coverage and average mentions of the two aggregators, for the same set of articles, vary across different platforms, with Altmetric.com recording higher mentions in Twitter and Blog, and PlumX recording higher mentions in Facebook and Mendeley. The article also analysed coverage and average mentions captured by the two aggregators across different document types, subjects and publishers.

社交媒体对学术文章的关注度提高，导致创建了平台和服务来跟踪围绕它们的社交媒体交易。Altmetric.com和PlumX就是两个这样的流行的高度度量聚合器。学术文章在不同的社交平台（例如Twitter，博客，Facebook）和学术社交网络（例如Mendeley，Academia和ResearchGate）中得到提及。聚合器跟踪社交媒体和学术社交网络中的活动和事件，并出于各种目的向研究人员提供覆盖率和交易数据。先前的一些研究比较了不同的高度计聚合器，发现它们所覆盖的覆盖范围和提及的内容有所不同。本文尝试通过对两个聚合器捕获的高度测量提及进行大规模分析，得出集合1,785，从而重新讨论该问题。Web of Science的149条出版记录。获得的结果表明，与Altmetric.com相比，PlumX跟踪更多的高度测量来源并捕获大量文章的高度测量事件。但是，在不同平台上，针对同一组文章的两个聚合器的覆盖率和平均提及率有所不同，其中Altmetric.com在Twitter和Blog中的提及率较高，而PlumX在Facebook和Mendeley中的提及率较高。文章还分析了两个聚合器在不同文档类型，主题和发布者中捕获的覆盖率和平均提及率。在不同平台上，针对同一组文章的两个聚合器的覆盖率和平均提及率有所不同，其中Altmetric.com在Twitter和Blog中的提及率较高，而PlumX在Facebook和Mendeley中的提及率较高。文章还分析了两个聚合器在不同文档类型，主题和发布者中捕获的覆盖率和平均提及率。在不同平台上，针对同一组文章的两个聚合器的覆盖率和平均提及率有所不同，其中Altmetric.com在Twitter和Blog中的提及率较高，而PlumX在Facebook和Mendeley中的提及率较高。文章还分析了两个聚合器在不同文档类型，主题和发布者中捕获的覆盖率和平均提及率。