They aren't your friend's photos. As soon as you upload them to Fascistbook, Fascistbook takes ownership of your photos and page content.
I realise that, so that is why I say that the data must be erased in the upload process with their software as some kind of protection, the same as if you upload a photo to your album in this forum and probably other vbulletin as well the exif data in your photo is replaced by the forum data as to the date size and other data,...the camera brand, model etc. is erased.
But not so, when a photo stored on photo bucket,image shack, flicker. etc is hot linked to the forum. Then the data remains intact.
So a lot of what ABC said while technically correct for certain web sites doesn't cover everything.
That data can be useful if I see a nice photo by someone who has the same type of camera I have. I can find out even if that person doesn't remember, all the settings he had for taking that picture.
It also came useful for me in 2000 when geocaching I placed some scenic pictures of the area, on a floppy disk in the geocahe bucket as my contribution to the cache, in exchange for what I took from it.
It turns out that the next guy who visited that particular cache and took the floppy (which was OK) turned around and posted it on a geocaching site as his own.
Well, I sent an email to the editor/webmaster of that site along with a photograph of my computer screen with the same camera and a copy of the original and instructions for him to compare the three and to verify that they were all taken by the same camera.
The photo was then credited to me and the other guy banned for plagiarism.