Facebook Blaster Pro question

Hi,
Recently I started to use FB Blaster and I'm wondering about few things...

I opened few accounts, and sending up to 40 friend requests.
For some accounts it goes fine, but some getting blocked after 20 requests only.

I tried to log in from different IPs, but looks like the issue, because some account getting blocked even then.

Any idea what might be causing that?

I will be glad to get some suggestions.

Thanks

That's terrible news. A lot of people in here are also having problems with the banning thing, well I hope it gets fixed anyway.

Accounts not actually getting blocked, but facebook asks for phone verification for them.