Truth is, they have this weird code-network that basically uses the same preset-code as Google does... so, when it comes to hack it, you need to break SEVERAL firewalls in order to get in, and that's just to enter the base-core. From there, you need to get another treat and break the other security measures to enter the account the you are looking for...
So, in easy terms: You can't hack it without having a propper knoledge of what you're doing.