https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference
Typesetting questions using LaTeX is not that difficult as there only a handful that are commonly used when posting here.
This can be used as a guide to get started in using LaTeX.
If people want to post image comments using LaTeX on Facebook etc, they can use: http://quicklatex.com/