If Facebook account is hacked we should have three things

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Why is Facebook account hack? Some time ago, I heard three million accounts in the hacker. So, why this may be due to weakness in the Facebook authority or the customer।
So today we will talk about these things. We have seen that what can be hacked because of our ID।
1 Because the reason that our negligence is due to accountability hacks here is not the weakness of the Facebook authorities।
We need to use our powerful passwd to survive such problems