Patterns — mobile
Provide an ambient notice (unobtrusive, non-modal) when location is being accessed to increase awareness of ongoing tracking.
Active broadcast of presence
Users may choose actively when they want to share presence information, to increase both the relevance of, and control over, sharing.
How can a service effectively provide notice to a user who gave permission once but whose information is accessed repeatedly (perhaps even continuously) over a long period of time? Proactively notify the user after the time of consent that information is being tracked, stored or re-distributed.