^ they are cracking the passwords, not really ''jacking''
cracking is a form of bruteforcing (programs that you load in list of passwords, and it goes over-night,hours, even days, tries each password, when it cracks it, well you get the password!)
Most hackers use bruteforce attempts or even dictionary attacks.
A bruteforce attack consists of typing in all possible combinations for the passwords, and YES it is a bitch and it takes forever.
Dictionary attacks are lists of possible combinations but it doesn't have even close to all combinations.
I would go with Bruteforce Attacks but even those aren't easy and they took forever. Most programs block IP's if they've tried so many times, so what most people do is they integrate a proxy in it.