WordPress MU Sitewide Tags Pages provides the option:-
Post to main blog
Create posts in your main blog. All posts will appear on the front page of your site. Remember to to add a post loop to home.php in the theme directory if it exists.
What does it mean?
1/ I am thinking that slecting that option makes the main blog to be indexed by search engines; even if you selected the option <<Tags pages will not be indexed by search engines.>>
2/I noticed that when I deactivate the plugin, the posts remain on the main blog taking new urls(replacing the permalink of the url with that of the main blog (example.com/blog/permalink/).
I am assuming that is an outcome of selecting the "Post to main blog" option.
Am I right?
Thank you in advance.