What would be the best way to add a fontawesome icon to the posted on meta WITHOUT using the :before pseudo-element in CSS but rather adding the actual <i> code? The key reason for doing that vs. CSS would be to be able to define that as aria-hidden.
However, for the future would you give some thought to consider inserting the FA icons (see also the tags and categories icons in blog posts) using the <i> tags rather than the :before pseudoclass as using the <i> tag with ARIA syntax improves accessibility and is the suggested way by their own guidelines: http://fontawesome.io/accessibility/