Files of interest:
/files/video-cache directory contains videos from the user's newsfeed, though there does not appear to be a way to correlate them back to the user who posted them.
/cache/images directory contains images from the user's newsfeed as well as the profile photos of contacts. This directory contains a multitude of other directories (65 on our test phone), and each directory can contain multiple
.cnt files. The
.cnt files are typically
.jpg files or other image formats.