I just talked to someone at WordPress support, and they said the problem only seems to be affecting custom sites. That means, if you have .wordpress in your site’s address, you shouldn’t be affected. If you pay for your site and you don’t have a .wordpress.com site, and your pingbacks don’t work, please let support know.
Proof that they’re doing something: I got a pingback tonight. Problem was, it was from Margret’s post here:
but the link pinged back to here:
https://lindaghill.com/2013/04/21/how-comments-can-hurt/ – a post of mine from three years ago.
Weird. Hopefully things will be back to normal soon.
Have a good night all!