If you’re accessing Facebook via a web browser on a computer:
1 – Log into your Facebook account and click on your name to visit your Timeline page.
2 – Click the Activity Log button located in the bottom-right corner of your cover photo.
3 – Click the Hidden From Timeline link over in the left-hand column.
4 – Find the post you want to unhide and click the icon over on the far right side of that line. It should look like a tiny circle with a slanted line through it.
5 – Click Allowed on Timeline.
If you’re using the Facebook app on a mobile device:
1 – Log into your Facebook account and tap on your profile photo to visit your Timeline page.
2 – Tap Activity Log.
3 – Tap Category.
4 – Scroll down and tap Hidden From Timeline.
5 – Tap the down arrow beside the post you want to unhide, then tap Show on Timeline.