First of all, I would like to say that even though I want to uninstall and delete my Facebook app, but I can't. There are many things involved in the university that uses Facebook streams.
I understand this and it makes things difficult for those who don't want to use the Facebook-personal-information-gathering software app. There was a time when it didn't exist though, and life seemed to travel along quite well without it.
The quote says "a friend" meaning it is only one. That being said, is already false. I don't think we only have one friend though.
I think it implies friends mate, not singular.