I've just been checking in case I'd accidentally marked one of my own posts as spam - I did trawl through the everbuying thread last night to do my bit for spam weeding. I did find one post that was from a spammer but wasn't in itself spam which i had marked as spam. But apparently I didn't mark my only post in there as spam. My score was zero about 3hr ago. I think.
I should be able to, but that feature is not working for some reason at the moment. But don't forget, 31+ day users with more than 15 posts are immune to blocking, so no worries. ;)