I don't.
Marc, I don't know whether you have any information on that.
Private groups are private groups. One interesting anecdote, really, is how people are using these things. We were with Niki Ashton over the summer a year ago, up in her riding. She said, if you want to know how first nation communities are using Facebook groups, you should come and see this.
We went with her, and she was indicating how everybody in the community was actually in the Facebook group. When it was time for little Jimmy to come home for dinner, rather than call somebody they'd just post in the group, “Tell Jimmy it's time to come home.”
Indeed, out in many communities, and especially remote, rural ones, Facebook groups are incredibly powerful for sharing. Presumably then, that includes the sharing of articles.