http://www.washingtonpost.com/blogs/the-switch/wp/2017/10/05/russian-propaganda-may-have-been-shared-hundreds-of-millions-of-times-new-research-says/

Facebook has said ads bought by Russian operatives reached 10 million of its users.

But does that include everyone reached by the information operation? Couldn’t the Russians also have created simple — and free — Facebook posts and hoped they went viral? And if so, how many times were these messages seen by Facebook’s massive user base?