Would love to see this. I know you can have sharing - but it buzzes me every time one of my family (only ones on my sharing list) does an exercise. I really don't want to ask friends as I don't want to disturb them every time I do an exercise. lol.
Just having a "family" or "group" or "clan" where we all work together and see how many steps we all do per week with a history and list of achievements would be pretty awesome (and an overall rank if group is public versus other groups).
I had a FitBit too and enjoyed the most steps challenges and what not. Their app was pretty good - the band, not so much.