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central Community Guidelines, although some have additional rules described in the chat description (e.g., “feel free to observe or participate, don’t worry, we don’t know what we’re doing either”; “DM your information to get accepted”). Group chats hold a maximum of two hundred participants, and the more popular chats often migrate to Discord servers to allow more people in, and because “chat functions in tumblr are super basic” as reported to us by a moderator in a group chat we observed. tumblr’s aim in adding this feature seems to be to allow “niche communities” to “create dedicated spaces to talk about their interests instead of simply reblogging someone else’s post” (Alexander 2019). Uploading images and GIFs is not possible in group chats. The conversations in the group chats we observed usually consist of sharing links to tumblr posts, memes, or Archive of Our Own fanfiction stories, and discussing those. Parody chats (e.g., “we all pretend to be middle-aged moms”) only discuss issues in character. A user only sees the chats they are part of and those recommended by tumblr, while a directory of all group chats is not available at the time of writing.

      Governance

      While the features and functions of tumblr tell us about the platform at a level of the interface, tumblr’s governance tells us how the platform is structured more broadly, and how and what Tumblr Inc. thinks users should be able to do. Platforms are governed by laws, regulations, general industry logics, and their owners’ vision, but they also govern us, their users, by setting explicit rules, making design and functionality choices (e.g., defaults and mandatory fields in profiles), and policing our behavior for compliance (see van Dijck 2013; Gillespie 2018; Light et al. 2018). The central piece of legislation governing American-owned social media platforms, including tumblr, has been Section 230 of the US Communications Decency Act (CDA 230). It states that internet intermediaries – including social media platforms – are not liable for their users’ harmful speech, yet are allowed to regulate it as they see fit, without losing this “safe harbor” from liability.3 While CDA 230 has consistently been heralded as the cornerstone of internet innovation and free speech, it has also been critiqued for letting social media platforms off the hook on a false premise that they are not shaping, amplifying, and suppressing content for profit (Marwick 2017). Here, we discuss how participants, practices, and content are moderated on tumblr. We follow this with a brief discussion on how algorithms are used in content moderation.

      Moderating participants and practices

      tumblr has never made any prescriptions about usernames beyond stating, since the 2012 update to the Community Guidelines, that “Tumblr’s URLs (usernames) are for the use and enjoyment of our users” and should not be hoarded, traded, or sold, nor registered for the purpose of impersonating someone. The 2012 accessible translation added to this that, “if you want to parody or ridicule a public figure (and who doesn’t?), don’t try to trick readers into thinking you are actually that public figure” (Community Guidelines update 2012). Setting up an account has only ever asked for a functioning email address and your age; tumblr has always accepted pseudonymity. The 2012 Community Guidelines also introduced “non-genuine social gesture schemes” (artificially enhancing one’s follower count), “mass registration and automation,” “unauthorized sweepstakes or giveaways,” as well as fraud and phishing into the list of “What tumblr is not for.”

      Moderating content

      Figure 1.4: The public service announcement (PSA) returned when one searches for “proana” on tumblr. Screengrab by authors.

      Scholars focused on sexual social media have remarked that American-owned platforms seem to presume that, in the list of offenses we started this section with, sexually explicit content will deter advertisers the most (see Paasonen et al. 2019; Tiidenberg and van der Nagel 2020).6 It is perhaps unsurprising that just as David Karp’s attitudes toward advertising differed from many of its competitors (see Chapter

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