Or destroyed by one user (currently your example talks about boobs).

But it's got the full history so it's very easy to walk back if modified (as I did), and there are variable restrictions to make it so that only more trusted users can modify it.

The replies in the meta-topic are one of the 4 cathegories: sources, discussions, viewpoints, humour. These are also flags/enum. In time there could be some more. They are not necessary in order, but can be filtered or sorted.

This is a really great idea! What if we strip it down even more, and instead of 4 types we have just 2 types: comments (like regular) and sources. Sources consist of only a URL and a headline title limited to 300 characters or so, that must be a copy of the article headline.

Then for a user to submit a source, it'd have a separate box next to the "add comment" box that is already there so users could submit alternate sources. And a source would appear differently from a comment in coloring so it would be obviously different, and would be able to be sorted out differently by the sorts. And people could comment and vote on them like normal.

This is not a bad idea...