I don't know how to get EXIF data from a downloaded image. I added them manually. ImageBrowser and the Mac's Preview program have them.
Very strange. I used Photobucket, the same as always.
And, was it the original image that you uploaded ... and not a resized version, even if the resized version was the same size as the original?
In Photobucket, I clicked on the magnifying glass with the + sign and it opened up the original image. I checked the EXIF and it was there.