How many accounts have you used from the IP that you created it from? Did you create it and then immediately start posting in groups, pages, or adding friends?
I have never had this issue before. But I agree that if you have many accounts, all from one IP, this may very well be the reason.
Yes i was immediately start making posts on one news page
May be you have created so many accounts using the same IP?
stop creating account two days. then create per day 2 acc