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A social networking service is an online service built primarily to help people connect or interact with other users and share or view content through those relationships. Profiles, user connections, posts, feeds and comments are common features, but there is no single definition that applies in every country or legal context.

What makes a service a social networking service?

The defining idea is social interaction between users. A service fits the ordinary functional meaning when connecting people or enabling them to interact is a central purpose, often alongside sharing content. Users may create accounts or profiles, link to other users, post or communicate material, and view content from people they follow or otherwise connect with.

These features help describe the category; they are not a universal legal checklist. A service might include profiles and user posts without making social interaction its primary purpose, or it might enable social interaction in a way that a particular law treats separately.

How legal definitions differ

Governments and lawmakers define social media or social networking services for particular laws and policy purposes. Those definitions can use different tests, exceptions and service categories. A plain-language definition explains the general concept, but cannot settle whether a particular service qualifies under every law.

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Australia: a statutory test for a particular law

Australia’s Online Safety Act 2021 defines a social media service for that Act by asking whether an electronic service has the sole or primary purpose of enabling online social interaction between at least two end users, allows users to link to or interact with other users, and allows users to post material. The Act’s explanation of social interaction includes sharing material for social purposes, rather than business interaction. It also says advertising and advertising revenue are disregarded when assessing the purpose criterion. This is an Australian statutory definition, not a global test.

California: common features, not a universal rule

A 2021 background paper from the California Senate Judiciary Committee describes common platform features such as profiles, user pages where people can post material, connections to others, feeds showing connected users’ content, and interaction through comments. The paper notes that defining social-media platforms precisely is difficult and presents these features as discussion criteria, not a definitive universal framework. It gives Facebook, YouTube, Instagram, Twitter, TikTok and Snapchat as examples in that 2021 discussion; the list is neither exhaustive nor a current legal classification. Read the California Senate Judiciary Committee paper.

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Singapore and Canada: different approaches

In describing Singapore’s proposed Online Safety Bill, the Ministry of Digital Development and Information characterized a social media service as an electronic service whose sole or primary purpose is online interaction or linking between users, including sharing content for social purposes, and which lets users communicate content. This is the minister’s account of that bill’s approach, not a standalone definition for other jurisdictions. See the Singapore ministry’s account.

Canada’s government explained that Bill C-10 did not define “social media service,” on the view that the term was commonly understood and that a fixed legal definition might not keep pace with change. Its explanation quotes Merriam-Webster’s general description of social media as electronic communication, including social-networking and microblogging websites, through which users create online communities and share information, ideas, personal messages and other content. That is a dictionary description reproduced in a government Q&A, not a statutory definition. Read the Government of Canada Q&A.

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How it differs from messaging, gaming and other services

Not every service that lets people communicate is a social networking service. The distinction depends both on what the service is mainly designed to do and, for legal questions, on the relevant law.

  • Private messaging: Email, instant messaging, SMS/MMS and chat can enable communication without making broader social networking the service’s primary purpose. Australian law addresses several of these electronic service types separately.
  • Online games: A game may include chat, user profiles or social features, yet still be treated as a different service category. Australian rules identify online games separately in relevant contexts.
  • Professional networking and education: Services primarily for professional networking or development, or for education, may be excluded from a particular legal category.
  • Product or service advice: A platform focused on sharing information about products or services may also be treated separately under some rules.

For example, Australia’s age-restricted social media platform rules specify classes that are not age-restricted social media platforms, including services primarily for messaging, online games, product or service information sharing, professional networking or development, and education. The Act also cautions that whether a service is an age-restricted social media platform and whether it is a social media service under a separate section are distinct questions. These distinctions are specific to the Australian legal framework. See the relevant Australian rules.

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A practical way to assess a service

For a general description, consider these questions together rather than treating any one feature as decisive:

  1. Is social interaction a primary purpose? Look at what the service is designed to help users do, not just whether it happens to include a social feature.
  2. Can users connect to or interact with one another? Connections may be explicit, such as following or adding another account, or take another form defined by the service.
  3. Can users post or communicate material? Consider whether users contribute material or communicate it through the service, and how other users encounter it.
  4. Is the activity mainly social, or is it primarily something else? Private messaging, business activity, education, gaming, professional development or product advice may point to a different category under the applicable rules.

This is a practical description, not a binding legal test. For a legal classification, identify the jurisdiction, statute, exceptions and relevant date, then apply the current text of that law. Service features and legal rules can change.

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