This isn't MacRumors specific; both my computers and one at a client's house are throwing this error on any page loading content from static.ak.facebook.com, which is any page that has a Facebook like button on it, which is to say pretty much every page on the Internet.
It looks like an akamai CDN problem, but I'd assume that Facebook wouldn't have their certificates configured right. I don't suppose all you guys are on AT&T DSL? They could be having a DNS problem.
...no, wait, I think I'm using Google's DNS, come to think of it, so that wouldn't be it, either. Weird.