Skoot, swisskei,
Sharing generated images or links to the web site where you found some 3D models isn't a problem, but sharing a SH3D file is a form of redistribution of 3D models.
Thus, before choosing to share a SH3D file, be sure that the license of the 3D models it contains authorize you to redistribute them (3D models coming from Google Warehouse can't be redistributed for example).