Imagine that there is a multisite with lots of blogs and with the main blog.
On the main blog publishes the best articles from all blogs. Each such post is marked with tags and categories of the main blog.
Wonderful scheme, but ...
Duplicate content! This is bad!
And what if the main blog administrator could marking any post from other blogs tags and categories of the main blog? Thus, selected posts from the network of blogs would show in the categories and taxonomies of the main blog and would be available during the search & in category posts list etc. And when visitor click on the title of a post, he would opened the original post on the blog-donor.
May have ready solutions? Or maybe someone has ideas about how it can be implemented?
Excuse me for my english:) I hope I expressed my thoughts clearly ...