You might have been blocked by Facebook.
Facebook blocks profile based on :
- Friend Requests you give in given quantity of time
- Posts you post in given quantity of time
They have not specified any duration or conditions for which they might block someone. Take for example, a person keeps on sending friend request. Say,he gives 150 friend request within 15 minutes,then Facebook might get suspicious it might be a bot.Since these kinds of activities burdens their server,they might prevent that user to further do any actions. It is at this point of time,Facebook blocks people.
In their Help center,they have stated that Facebook would never lift block for any reason and the block would extend from few hours to few days.
Also when you do certain action while your account is blocked and that particular action is the reason for your account to be blocked,then your block will extend. Also Facebook makes sure that you don't do the same action in same frequency again after your profile is unblocked.
My advice is stay cool till Facebook unblocks you and then give friend requests/post status updates once or twice in day for a period of two or three weeks.
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