|example content in Google+ by Cambodians|
Why they are publishing content in Google+?
One first advantage of publishing content link in Google+ is about SEO (Search Engine Optimization), the link will be craw well by Google search engine.
The more people +1 on your link, the more people can search your content easily since it's recommended by many people.
For me, I don't see that facebook could index well your content since you have published many links in your profiles or page but Google + could do that like a charm.
How do you think?