My specific issue here:
Devices set to sync by using same username and password:
Device 1 = Android*
Device 2 = iPhone
Devices 3 & 4 = Touch
Add to D1, shows up on all other devices.
Add to any other device, shows up on all devices EXCEPT D1
*Samsung Fascinate (Verizon)
Device say to share by invite, by site says to share by using same login.