I liked the idea of circles but G+ never really stuck for me. One thing I think about is tagging. Arguably circles is a private configuration. If I tag someone

I liked the idea of circles but G+ never really stuck for me. One thing I think about is tagging. Arguably circles is a private configuration. If I tag someone in a picture I posted to my Family Facebook Circle, but who on their end would see it on the timeline? I never used G+ enough to know how it handled that scenario. My intuition wants to tell me it's tricky things like that which piled up in Facebook's mind when evaluating whether to copy them. They've copied many competitors and social media outlets especially if it fit easily. Privacy features isn't one of their strengths.