Question:

I was just wondering like will you loose all your messages, likes on photos and all that or will it all come back again when you activate it again? :)

My Answer:

When you deactivate your Facebook account, it just disappears temporarily. And everything comes back while you sign-in again in Facebook and reactivate your account.
The deletion of messages, likes and photos etc happens when you delete your Facebook account permanently. But according to my research, this option is no longer available in Facebook now.

Question:

I got a notification on my mobile device saying "you have x notifications and 1 poke" but I did not find it in my Notifications window on my Facebook account. How can I find out who poked me?

My Answer:

You can see your pokes activity on your pokes page. It will begin showing you how many times you've poked back and forth with a friend after you've poked them more than once.
URL to your pokes page: https://www.facebook.com/pokes
Source: https://www.facebook.com/help/451424538215150/