Now that there have been some major improvements to iCloud that make sharing data with other users simpler, the plan is to implement them after Apple Health integration is launched so we can start building the Accountability feature.
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Would be cool if we could share habits with closed groups of friends, like in MyFitnessPal. Even better, if we can include different friends for different habits. For example, I want to share my exercise habit with my sister, but my sobriety habit just with my AA friends.