Terms of use of service
What cannot be uploaded to servers:

Copyrighted images if you don't own copyright for it
Violence, racial intolerance, or advocate against any individual, group, or organization
Any other images that might be considered illegal in USA or EU countries
If you are not sure whether image you want to upload is allowed then do not upload that image. All uploaded images are checked by staff and images that violate terms will be removed without warning and uploader of such images might be banned from website.