This is something similar to popular Hotmail yahoo mail account password hacking that you can find in ebooks websites and blogs. This time they ask 100 US dollars to hack any Facebook account. Is it just a phishing site or for real?
There is a simple way to get $100 which you cannot complain to any authorities as you are trying to hack someone else Facebook account. Overall this type of campaigns are phishing and either it will collect your username, password, other personal information or get money out of you.
Do not give out any information or send money to any of these type of hacking password retrieval services available online. They know you are doing something bad.
For more information read Your Facebook Account Worth $100 by Luis Corrons