PR 0 Again!!!???

While my other 2 blogs earned PR 1 recently this blog is back to zero again. I checked the Google webmaster to check if I have violation like what happened early this year but there’s no message in my account. I’m wondering why I lost my PR 2 where in fact I tried to join meme’s to gain back links. Or perhaps this cause the dropped of my page rank. But I guess it’s not. Other bloggers do participate in different memes but they don’t suffer same consequence.