are there any news regarding this? On one particular site, it's becoming a larger problem that it should be.
I passed along the suggestion, BTW, and our team plans on including this for the upcoming blog update on our Product Roadmap. So, blog posts will have this capability of being unpublished.
They are considering it for the forum (and all replies), although there is still some disagreement about how deep this should go and whether all replies is the way to go, but most of our folks see the benefit of hiding content in this way. So, ultimately, it's undecided, but it's much more likely than it was that you'll see this functionality. However, to be clear, it won't be coming in the next month or two.
I know that you are unhappy with some of the features and functionality and have expressed a strong desire to move to another platform. If these types of improvements are coming too slowly for you, I can understand. I would recommend a move if staying here would continue to make you unhappy. I definitely do not want to promise something to you that might take six months to appear, or that might never appear, and make you more unhappy with Ning.
Maybe ultimately the answer is to decide whether you want more of a forum (e.g., phpBB), more of a publishing platform (e.g., Wordpress), or a general community tool (Ning).