Tamaya wrote:
But how would you know what words to use in the search bar to find the photo if it's from another person's Facebook page?
In Google Image Search, there is the ability to drag and drop or to upload a photo and search on that photo. It can be quite useful.
At
https://images.google.com/, notice that in the search box on the far right there is an icon that kind of resembles a camera. If you hover the cursor over it, you should see "Search by Image".
It gives you three options:
1) "Drag an image here"
2) "Upload a file"
3) "Paste image link"
It uses the picture you provide as the search criteria, not some typed in search terms.
But yeah. If it is on a private Facebook page, you might not find it. It doesn't hurt to try, though. It's really quite easy to do and shouldn't take long at all to do. It's so simple that there is no reason not to do it.