I can't open facebook in facebook apps but in safari can open. Need help to solve this problem

Hello Fandi_,

Thank you for posting in the Apple Support Communities.

It sounds like you're unable to open the Facebook app on your iPhone, but you can use Safari to access the Facebook website. We'll be glad to assist.

To get help with the Facebook app on your iPhone, use these steps: If an app unexpectedly quits, stops responding, or won’t open

If you're referring to something else, please give us more info. We'll be glad to assist further.

Have a great day!