So I made a new project over on hackster: Does the light inside your fridge go off when the door shuts - Hackster.io
This is my initial attempt at writing JSON code through to the Thingspeak API so that mutliple data fields can be updated at the same time.
It's working well, has a few issues like the Location is wildly inaccurate when it's initially read the first 4 times or so, after that it seems to come good and report the lat and long to within less than a hundred meters or so which is pretty awesome.
I think next I'll work on a geo fencing example 
Anyway have a look at the project over at Hackster and let us know what you think...
Cheers