"Your account is currently unavailable due to a site issue we expect this to be resolved shortly".

"Your account is currently unavailable due to a site issue we expect this to be resolved shortly".

So what this error means?  my friend encountered this error when she was trying to open her Facebook account and nothing happened if she's trying to select Fix now, then she was worried thinking that her account was hacked by someone else that's why she asked help from me regarding this error. I didn't encountered this error before that's why my first advise was to clear Facebook's cache and data since she was using Facebook apps for Android. I am confidently sure that her account didn't hacked by other because she can still use her Facebook Messenger and it was Server's problem (Site issue as stated in the error) While waiting for her response if the error persist or resolve, I've tried googling this error to check if there's other solution for this once clearing of data do not work, and just to confirm the main cause of this problem.

Then I found some forum regarding the same error, and I was confirmed that the said error was normal, the main cause was the Facebook server's downtime and outage for some accounts. So, since this error already encountered, there's a possibility that the error will retain to the browser's cookies or apps. To resolve this problem, just clear all cookies and history from your browser, If you're not sure how to clear cookies, Just follow the steps below:

How to clear Cookies on Firefox?

1. Go to Tools 
2. Options 
3. Privacy then click the link  remove all cookies.

How to clear Cookies on Internet Explorer?

1. Go to Tools 

2. Internet Options 
3. General Tab then in the browsing history click the delete button check cookies and click the delete button.

How to clear Cookies on Google Chrome?

1. Open Chrome
2. On your browser toolbar, click the Chrome menu
3.  Click More tools > Clear browsing data.
4. In the box that appears, click the checkboxes for "Cookies and other site and plug-in data" and "Cached images and files."
5. Use the menu at the top to select the amount of data that you want to delete. Choose beginning of time to delete everything.
6. Click Clear browsing data. 

How to clear Cookies and Data for Facebook Apps.
1. Go to Settings

2. Application Manager then select Facebook
3. Tap Clear Data