Multiple new Facebook accounts are temporarily blocked

Hi guys, I have a problem with my recently created fb accounts.I created about 30 new accounts using dynamic pull of IP's. Some time after creation I was asked to verify them by phone number. It was made successfully, but at the next day almost all of them were blocked for 30 days on commenting and adding pages 'cause I "didn't pass the security check".

When I created my accounts, I sent 9-10 friend requests, add 2-3 groups, 5-6 photos and reposted 1-2 records, all accounts are verified by phone. I created about 10-15 accounts a day. IP is changed every time I reload the page.

Does anyone knows some ways to avoid this blocking? Will be very grateful. Sorry for my English.

did you clear the cookies while switching the accounts ?

May be you tried shared proxies or cookies or flash cookies were still there.
I guess best way is to flush DNS dedicated proxy pva's may be aged pva's does better.

No, I haven't cleared them, I'll try.
Is the a reason to buy some private proxies and use one for 2-3 accounts if it won't help?

Do you use free proxy or paid proxy? I suggest you to use foxyproxy on Google chrome and open a new incognito window. It will help you to keep your browsing private and you no need to clear cookies. Don't send any friend request on the first day.

I don't use proxy, I just have a dynamic IP. It switches every time when I refresh the page.
Is it good enough or should I use proxy?

Most likely the problem is in proxy.

If you will unblock your accounts they could be blocked again. So you should use proxy next time if you will create more than 5-10 accounts.