PR dropped to 0

I always start my day logging in to Plurk. It's like my daily routine. And as I was scanning through my plurkmate's shoutouts, I came across with this one; "will check my site's PR if na-itlugan pud bah'g apil... " As i read this i quickly checked my blog. And got this bad news today. (>へ＜) my page rank dropped to zero. maybe because I haven't had any updates for the last month, or maybe nobody's visiting my site anymore, or maybe it's because I have many paid post. maybe, but I don't really know. I don't know. hahayZ..