MathJax is used on
mathoverflow.net, and there is a TeX
stackexchange, so I am not understanding that you are asking.
On Thu, 4 Feb 2021, Jonathan Fine wrote:
> I'm interested in promoting the use of MathJax / LaTeX on social media web-sites. Leading examples
> are
https://math.stackexchange.com/ and
https://mathoverflow.net/. Arising out of the user experience for
> beginner I've formulated 3 questions.
> 1. A social media site for learning LaTeX math. It this a good idea?
> 2. Are there already such sites?
> 3. How good are they, and can we improve matters?