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Web archiving services play an increasingly important role in today'sinformation ecosystem, by ensuring the continuing availability of information,or by deliberately caching content that might get deleted or removed. Amongthese, the Wayback Machine has been proactively archiving, since 2001, versionsof a large number of Web pages, while newer services like archive.is allowusers to create on-demand snapshots of specific Web pages, which serve as timecapsules that can be shared across the Web. In this paper, we present alarge-scale analysis of Web archiving services and their use on social media,shedding light on the actors involved in this ecosystem, the content that getsarchived, and how it is shared. We crawl and study: 1) 21M URLs fromarchive.is, spanning almost two years, and 2) 356K archive.is plus 391K WaybackMachine URLs that were shared on four social networks: Reddit, Twitter, Gab,and 4chan's Politically Incorrect board (/pol/) over 14 months. We observe thatnews and social media posts are the most common types of content archived,likely due to their perceived ephemeral and/or controversial nature. Moreover,URLs of archiving services are extensively shared on "fringe" communitieswithin Reddit and 4chan to preserve possibly contentious content. Lastly, wefind evidence of moderators nudging or even forcing users to use archives,instead of direct links, for news sources with opposing ideologies, potentiallydepriving them of ad revenue.

Understanding Web Archiving Services and Their (Mis)Use on Social Media