Why FB blocked my account?

[Nagy]

I've created a separate account on Facebook to play a game. For this purpose I've sent a few (about 50 -100 maybe less) requests for 'friendship' in order to have my desired amount of teammates to play this game. Nothing unusual, a lot do that! After 3 days FB has locked my account and for security reason they've ask me to recognize my 'friends' pictures. Ofcourse I've failed and I'm still blocked. Is this right?! I'm aware that it's a private business and they make the rules...but am I do so wrong?!
PS: apologize for my bad English...
To @zafir: actually I've pick all the people from a FB page dedicated to this game. I didn't send requests for random people. All of them are there to form a group with the message: 'add me'. I just join them.

[Graffiti]

Fb might have recognized your actions as spam that's why they blocked you

[zafir]

I suspect a number of the people you've invited have complained to Facebook, simply because they have no idea who you are. Most people are security conscious these days and even Facebook warns users not to accept anyone they don't know as a friend.

It's wrong and rude of you to invite a lot of complete strangers to be your friends. Facebook is right in blocking you as they have to protect users against such invasive tactics. And why aren't you asking Facebook this question?