Thanks for the post about Subjot. (I'm the cofounder)

Subjot combines your social graph with your interest graph. We sometimes refer to it as a microforum: part microblog and part forum. You assign a subject to every post. You can find posts by subject and create a feed of only the subjects and people you care about. The emphasis on subjects helps you find friends, new and old, who share your interests, enabling you to have more meaningful conversations with them.

I also wanted to note, you do actually get notifications when someone mentions your name! Via those Quora-like notifications at the top, the one on the far left notifies you if you have been mentioned or if someone has commented on one of your posts.

Thanks again! I hope to see more of you on Subjot.