For example, I found an Aperture export app. I'd tried using export to Facebook from Aperture, but it didn't work for me (buggy?). So I deleted it. Funny thing is, I don't remember anything about a FB app, that was an OS X app...
[Ok, I'll cheat. As you'll see below, I later realize that when you use a Facebook "feature" on the desktop, there's a companion Facebook "app".]
That's how I came across some funky iPhoto Uploader app without any author or profile information to speak of, but with mediocre reviews. I don't need that shoddy app I thought, I've been using the built-in function that comes with iPhoto '09. So I deleted it.
Then a thought occurred to me.
Yes, I returned to iPhoto, and now when I clicked on the albums that sort-of-synchronize with my FB albums I got an error message saying the upload had failed ...
... authentication with server failed. Please check your login and password information...
Clearly that mysterious iPhoto Uploader app was the 'companion' to iPhoto '09 (I wonder if it's a real "app" or just some kind of authentication framework shoehorned into the "app" slot.)
So how could I restore it? Apple doesn't provide any documentation on this sort of thing -- that would be against their religion. I played around briefly, here's what worked
- select any old picture
- click the facebook button to upload it to FB
- you'll see the upload button is grayed out. Click the "change account" button. You'll now be able to reenter your un/pw credentials.
After you reenter credentials you can sync your FB albums again, and the iPhoto Uploader "app" will reappear in your Facebook app settings page.