It's 12 bytes every 10 minutes. 96 bits. Not much for a tweet, but you can stuff quite a lot of data in 96 bits.
For example, say you're tracking fragile cargo :
2 bits - battery level (2 bits - 4 values, high / med / low / replace)
2 bits - status of 3 tamper switches (00 - all ok, 01/10/11 - a switch has been triggered).
6 bits - a temperature range of 64 degrees, in celsius, from starting from -14 to 50 degrees, 1 degree resolution.
6 bits - humidity (64 values stretched to 0-100, gives us about 1.5% resolution)
2 bits - whether temp or humidity has gone out of bounds since last transmission (and a spare value here).
6 bits - current speed 0-64 m/s (0 - 230 kmph/ 144mph)
6 bits - max speed since last transmission in m/s
48 bits - lat and longitude, good to about 11 metres globally.
18 bits - max g-force sustained in the last ten minutes (6 bits/64 values for x/y/z, scaled to 10g, so good to 0.15g)
Tada, 96 bits, full of info.