Getting a lot of missing avatars, and font-awesome is missing too. It all seems to be related to issues with cdn.discourse.org. Reproducible on here and at Sitepoint.
Digging further, this may be an issue with my ISP. Not 100% sure yet, I’m switching to a public DNS to see if the issue resolves itself (and it seems it solves the Discourse CDN issues, both here at Meta and SP).
We haven’t received any other complaints about this (and it’s working for me) so I think it’s likely it is a DNS or isolated issue.