Actually beside do the formal procedure of FB hacking via Network or Social Engineering, there is the most powerful and useful link u can use to "HACK". Simply, FB administration will HACK them for u!
Step:
1. Find this LINK:
2. Click the link.
3. Tick any (Don't block - u can spamming Report)
4. Invite/tell ur friends to do the same (like DDOS thing-lolz)
5. Report it as many as u like to report it and until the acc has been down..