Once you've exported it from LR (or PS), make sure you just use standard export, and right click the files and click properties.
If at that point, in the 'details' tab the info is still there, then upload it to somewhere like Flickr which won't strip the exif. I suspect maybe Photobucket is stripping the exif (which is a right pain)
If it's not in the details tab, it's something to do with how you're exporting, and you'll have to look into your LR settings.
Alternatively, what camera/lens/focal length/shutter speed/apperture did you use? That's all people really care about in the EXIF xD
kd