Jeremy Wagstaff summarizes:

For the first time, as far as I know, an advertising company not only has access to what we’re doing (our presence message), they have access to where we’re doing it (the cell ID etc), what we’re doing next (the calendar), how long we’ll be doing it for (the duration of the event), whether we’re focused on something else (indication of whether we’re on a call), as well as the usual preferences we may have registered in our profile (gender, age, interests, etc.)
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