I've been adding communities that we're missing, and adding content to populate the site. Sometimes this content applies to multiple communities, so I tried crossposting and it was so easy!
On top of that, reading articles outside of the site then trying to post it here but I'm worried I might be duplicating posts. It's so easy to see that the content was already posted and I can just link to it.
When someone edits that cross post, it also shows up in other places too. I think that's how it works. People cross-posted my posts for the first time and when they added content to the body, it showed up in the other locations too.
You can see which communities cross posted as well, and go to those communities too. It helps in knowing where to cross post in the future.
I'm really loving this feature and it's making populating content so easy. Thank you!