As a Facebook user, this is something that would interest me. I never used the "group" feature however because I felt it was more work to curate the group than is worth it. I do like that each "moment" is called out so you know you are part of a select group that gets the image/message. Targeted information always works best IMO. It does seem like a G+ circle rip off. I agree with that point. I have a feeling that Facebook will get too big and people may want to start off fresh in 5 years.