The reason Parson's using Maggie to communicate, send orders, etc. is because
the Eyebooks have been hacked, remember?
Eyebooks can't tell you that they are currently being observed. Maggie, as an experienced Thinkamancer, should be able to tell that her Thinkagrams/whatever are being observed, unless those Archons outside/Charlie can read lips.
What's the resolution/bitrate on Thinkagrams? Can they be upgraded to HD? Does Charlie get the ArkenDish Network? XD