I had the same issue on OpenSUSE. ms fonts is installed. Tried with the following 2 browsers:
- Firefox
- Chrome
Are you on 16.04 ? If yes, give this command a try
sudo apt install ttf-mscorefonts-installer
There will be an EULA for which you should give " yes ".
Well, this is embarrassing but the language setting in facebook was set to something like Urdu (I don't know how) which caused the issue.