From the look of it when ever you make a post using a link at the top of the What's new in modded minecraft thread it creates its own thread and twitter post.
The threads were meant to focus discussion away from the main thread. But as there are only around a dozen replies I think that function has failed.
And the twitter thing was a good idea but you only get a half azzed list of what's bin posted as many posts can't fit into that format and other just aren't going to bother using it.
So yah just feel free to ignore it. It's a system that was opposed by the majority of forum goers anyway. And should never have bin created.