How to save the same post in multiple blogs?

You can hook on save_post or publish_post hook in each post and publish in other blogs. You must use the function switch_to_blog() to switch in other blog and then use [wp_insert_post()][2] to save a post inside this blog; do this for each blog.

Alternative is you search for a plugin, there doing this; like Multi Post. I don’t know if is the right and a good plugin. I had use the search on www.