To get an idea of the impact this feature has had, here are some stats.

* Due to Fennec user contributions, MLS has collected as much Wi-Fi and cell 
data in the last 6 weeks as it has in 6 months of 2014

The per-user burden is minimal, as indicated by the following stats:

Passively received GPS locations per day:
* 1-10 per day  ~50%
* 10-100 per day ~40%
* 100-2500 per day ~ 10%

Upload costs
* 90% of uploads are less than 15kb
* 2/3 of uploads are 24 hours apart or greater

One concern we had was that most users' devices were not going to trigger the 
GPS enough for us to collect data by passively listening for the GPS. So far, 
this does not appear to be the case.
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