Okay. Lets get this clear.
It requires you to exploit a security VULNERABILITY. Its not a simple loop. Once you discover the vulnerability, you just have to repeat it, in a loop, over the facebook website. It requires a high speed internet connection. But a large hard disk capacity would be enough for this, with a common computer, like those used for server.
You do know what is a brute force attack, don't you? If yes, only brute force attack will require a high performance computer, IF PROCESSING is involved. But in this case, the internet is involved. Once you get the logic, you just have to set up the loop. One go, thats it.
Remember the hacker Curador? He was an ordinary school boy who hacked millions of credit card numbers. Thing is, he got the logic and executed it. Now don't tell me he had a high performance computer.
So, better do some research on how many hackers have got a mainframe, or a supercomputer. At best, a server configuration computer is enough for any hacking purposes for the professional hacker. Usually a common computer like we use is enough.