...is the body font on posts... TAHOMA? With Verdana as the second?
Can we get something like Open Sans or Droid Sans? If you want a serif font, maybe Georgia or Merriweather? (You might be able to suggest better serif options) - In general, something a bit less visually cramped.
I do want to note that the compose window seems to be working in Poppins, which looks pretty alright, as another option:
https://fonts.google.com/specimen/Poppins
Feel free to be a font nerd on this and make your own decision, I'm just saying the current text settings are a bit condensed.