First things first, 1) Check if you have blocked anyone else. 2) Wait for the admins to give us ONE useful update instead of the overload of tweaks they've been releasing which no one seems to care about. 3) Being blocked is last thing you should be worried about, like seriously. If G@G keeps this up, sure enough there'll be no one to block you. Oh, the irony.
Nope, but there should be! I agree with @AleDeEurope. I have been blocked by people I don't remember interacting with, and I write this long detailed opinion and then hit "send it" and then it says I've been blocked! Grrrrr! >=(
No, there is no such list where you can find users. No, you can't really say who has blocked you. When someone blocks you, there is a notification that you receive saying that "you have been blocked by the user or you blocked the user", however the message won't specify who exactly blocked you.