Is there any way to get the older version of an app?

[Jojo]

I have an older iPhone, and I accidentally deleted my Facebook app, and I can't redownload it because the new version won't work on it

[LPunch]

This step has mixed results but let us know if it helped you.

Step 1
First off you need to delete the Facebook app of your iDevice. Please note you will need your computer and not have deleted the trash from your Mac before you got the update or this probably won’t work. Now once you have deleted the Facebook app from your iPhone then plug it into iTunes and go to the apps section, then click Facebook and control-I or right click the app and say get info. Anything under 3.5 will do.

Step 2
Now say you updated your iPhone and synced it so you have 3.5. Sure that happens and there is a way to get a lower version back if you haven’t emptied your trash yet. The way to do that is to go into your trash at the dock and find the Facebook.ipa or Facebook(version).ipa then you need to drag it into iTunes and it will ask you to replace it say yes.

Step 3
Next click on your iDevice in the sidebar in iTunes. Click the “Apps” tab and then check of the Facebook App. You should then have a working Facebook app and if you are jailbroken you can use the iPad app hidden in it! I hope this helps!