My ipad air suddenly deactivated in the midst of using it and now i cannot reactivate it

You can deactivate your account temporarily and choose to come back whenever you want.
To deactivate your account:

1. Click the account menu at the top right of any Facebook page
2. Select Settings
3. Click General in the left column
4. Choose Manage your account then follow the steps to confirm

If you deactivate your account your profile won't be visible to other people on Facebook and people won't be able to search for you. Some information, such as messages you sent to friends, may still be visible to others.
If you'd like to come back to Facebook after you've deactivated your account, you can reactivate your account at anytime by logging in with your email and password. Keep in mind, if you use your Facebook account to log into Facebook or somewhere else, your account will be reactivated. This means your Facebook profile, including things like your friends, photos and posts, will be completely restored. Remember that you'll need to have access to the email address you use to log in to reactivate your account.
To permanently delete your account: Permanently deleting your account means you won't ever be able to reactivate or retrieve any of the content or information you've added. If you'd like to permanently delete your account with no option for recovery, please contact us.

"If you've deactivated your account, you can reactivate it at any time just by logging in. If you can't remember your password, you can request a new password. Learn more about how to reactivate your account if you can't access the email address you listed on it."

http://www.wikihow.com/Reactivate-Your-Facebook-Account

" If you've deactivated your account, you can reactivate it at any time just by logging in. If you can't remember your password, you can request a new password. Learn more about how to reactivate your account if you can't access the email address you listed on it."

Taken directly from facebook and a link that could possibly help.

Log into the account you want to delete and then go to settings. You will see an option in there 'deactivate account' - click this to remove the account. After 60 days the account will be permanently deleted but before this time, it cannot be viewed or accessed unless you decide to reactivate it. In other words, if you really don't want the account then deactivate it and just forget about it!

you need to contect Facebooks staff and tell them so they can block it

Step 1:
Deactivate Your Facebook Account b> There may come a time when you need to deactivate your Facebook account. Fortunately, as with most of the social utility Web sites, closing your account with Facebook is easy. And if you change you mind, you can always return to Facebook with a simple reactivation process.

Access the Facebook home page and log in using the email address and password you originally registered with (see Below). Sign into Facebook and navigate to the "Delete My Account" page (See Below) https://www.facebook.com/help/contact.php?show_form=delete_account If you've forgotten you password, click on "Log in" and follow the link to reset your password. Head to the "My Account" page using the link from the menu. Follow the "Click Here" link under the Deactivate Account section. You will be taken to a short form to fill out before you close your account. Tell Facebook why you're leaving. Select the radio button next to the reason for deactivating your account. There is also space to write other comments. Opt in or out of Facebook emails. Even if you account is deactivated, your friends can still invite you to events or ask you to join groups. If you don't want any email from Facebook at all, check the appropriate box. Click the "Deactivate" button. You will be taken to a page confirming your account deactivation. Reactivate a Deleted Facebook Account Head to the Facebook Web site to reactivate your account. Log in to Facebook as if you'd never left. Use your original email address and password. Check your registered email account for a confirmation email from Facebook with directions on how to reactivate your account. Follow the link in the email. You will be taken to your home page, which will appear exactly how you left it. All your settings and events are intact upon reactivation. All you have to do is start exploring again.
Deactivate my account
http://www.facebook.com/help/?faq=13015

try opening fb account on a different browser or if ur r using fb app, unistall it and then reinstall it.

its very easy to reactive the yahoo account if it is once deactivated, simply go to, mail.yahoo.com and then click to, cant access my account then click the option My yahoo account is been compromised, then they ll ask u for the id that has been deactivated, then after giving the id they ll tell ask you if u want u reactive, click reactive, and then wait for 24 hours ur account will be reactivate, thanx

You're just going to have to make a new one...you can still use the same email address since it's deactivated, so if it says that the email address already exists, then you have to reactivate it a different way.

If your yahoo account was just deactivated (due to non-use or your deletion attempt) within last 90 days, you can reactivate it by logging in again. However, once deleted fully or beyond the deactivated 90 days period, there is no way you can recover that account. However, you can create a new account with that name. FYI: http://help.yahoo.com/l/us/yahoo/edit/changing_users/edit-23.html