Sorry. I just saw this. I use Safari. For a couple days, a couple things were happening. I use my history list to link to the site. Instead of getting the site, I would get a invalid message. I tried a Google search and a Bing. Same thing.
I hope they're upgrading the point system to show the people who +1 the post. That would give people an less space-consuming way to say they like a post.
Maybe someone thought it inappropriate to "give" someone a point just for posting.
I dunno.
No, it's a system problem, it's affecting everyone.