Mobile Plaintube is an external website and is not related to odir.org in any way. The owner of that website is responsible for all the content provided on their site Plaintube-Mobile.
This is a directory of similar websites for (hier plaintube.com), so the content may be like that one of the original site.
m.plaintube.com oder mobile.plaintube.com may offer content (text, images, videos, movies) which are optimized specially for phones, tablet-pcs and other mobile devices.
To get most of the sites working on mobile devices, all the content has to be reorganized and encoded (mp4, mov ...) to match the system requriements and the usability guidelines.