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Wikipedia documents social media as

Social media are interactive computer-mediated technologies that facilitate the creation and sharing of information, ideas, career interests and other forms of expression via virtual communities and networks.¹ The variety of stand-alone and built-in social media services currently available introduces challenges of definition; however, there are some common features:²

• Social media are interactive Web 2.0 Internet-based applications.^{2, 3}
  


• User-generated content, such as text posts or comments, digital photos or videos, and data generated through all online interactions, is the lifeblood of social media.^{2, 3}
  


• Users create service-specific profiles for the website or app that are designed and maintained by the social media organization.^{2,
  4}
  


• Social media facilitate the development of online social networks by connecting a user's profile with those of other individuals or groups.^{2,
  4}
  

Merriam-Webster defines social media as

Definition of social media

: forms of electronic communication (such as websites for social networking and microblogging) through which users create online communities to share information, ideas, personal messages, and other content (such as videos)

The plain meaning of the term social media is consistent with the published description of StackExchange and all of its sites, termed "175 Q&A communities" and "online communities" who "share their knowledge"

Stack Exchange network consists of 175 Q&A communities including Stack
Overflow, the largest, most trusted online community for developers to
learn, share their knowledge, and build their careers.

Are Stack Exchange sites

Launched in 2010, the Stack Exchange network comprises 173 Q&A
communities including Stack Overflow, the largest, most trusted online
community for developers to learn, share their knowledge, and build
their careers. Since then, the Stack Exchange network has grown into a
top 50 online destination with Stack Overflow alone serving more than
50 million developers every month. Stack Overflow also partners with
organizations that seek to leverage technology to innovate. Our
products and services are focused on enterprise knowledge sharing,
technical recruiting, and advertising. Learn more about our business
solutions here.

social media?

If StackExchange and StackExchange sites are not social media can you explain in an answer why StackExchange and StackExchange sites are exempt or excluded from the plain meaning of the term social media?