Well I got a notification just now. So...Oh man your right
Why????

Make sure that you are following them in their profile. If you can’t do that just go to their blog and click follow.

I had this problem with @mishailu where I wouldn’t get notified about blog posts. It’s fixed now. Also it might be in settings. There is a setting “follow friends”
I have followed for my friends and some good bloggers. But I don't get notifications when they post. And then I just saw later, that my friend posted again some stuff, but it hasn't notified me!?
I am not the only one, it's happeing with my friends too! Why?