1. A reddit-like circle jerk where the same stuff gets posted and the same conversations are had multiple times.
2. A reddit-like contingent of karma whores who repost stuff just to get votes.
3. A goldfish-like memory in HNers where they forget what happened just a short while ago.
The multiple posts about the same thing happen often when big stories break(Snowden's first leak, Steve Jobs death, Apple releases product iXYZ, etc.), but I'm noticing it now with some smaller stories, and it is frustrating.
My proposal is that the mods police these posts (I know they're watching, titles get changed all the time), and keep the front page fresh. When a big story breaks, maybe create a meta post- a "Snowden related links go here" post and when people outside of that official post they are either merged in or deleted. I realize it would require substantial changes to HN to add a meta post type and change the decay algorithm to account for a meta post.
Go ahead and downvote, but I figured I'd offer up an idea (that probably isn't original) instead of just complaining.