The TABs are technically hackable, but apart from network data, there isn't too much to find. Where network data is concerned, it's a matter of OOC permission-- a private or encrypted transmission can only be hacked if all players involved are okay with it.
Network data is saved, though, so yes-- unlocked posts and unsecured threads can be read by anyone who has the technical know-how! The only exception would be posts and calls made prior to the current TAB system. The communication system used aboard the Moira relied on a different sort of device (MIDs), so any character attempting to dredge up data from back then would be unable to do so with just their TAB.
no subject
Network data is saved, though, so yes-- unlocked posts and unsecured threads can be read by anyone who has the technical know-how! The only exception would be posts and calls made prior to the current TAB system. The communication system used aboard the Moira relied on a different sort of device (MIDs), so any character attempting to dredge up data from back then would be unable to do so with just their TAB.