Just done a experiment with Facebook.
Slice a picture into 15 parts (using Photoshop’s Slice tool) and upload into a new Facebook Photo album
How to divide pictures into 15 parts
a. Select slice tools then start to select the whole picture
b. right click then select divide slice
c. divide horizontally into 3 slices down and vertically into 15 slices down
d. export the images , by select File - Save for Web.
e. You’ll find a HTML page and a folder image contains pictures’ slices
check this out…