IMHO Google+ failed for one reason. At least it's the reason it failed for me. There was no way to post something on someone else's feed. When I used Facebook,

IMHO Google+ failed for one reason. At least it's the reason it failed for me. There was no way to post something on someone else's feed. When I used Facebook, this may have been the #1 thing that I used it for (and events). If I saw something I thought a friend would enjoy or made me think of them, I'd post it on their wall. This is drastically different than sending a message or e-mailing in that my friend's friends will also see it. In Google+ (at least when I tried it), there was no way to perform this action. So I never used it again.