You can upload lots of different file formats to 4Laughs:

mpg
mpeg
mpe
qt
mov
avi
wmv
3gp

The easiest way to check which files you can upload is using the media upload tool.

First, click on the 'Select File' tool.

This will launch the file finder. The bottom of the finder pop-up has a field containing all the types of file you can upload to 4Laughs: