This thing comes up regularly and in several forums. This week has been one of the worst I remember, so I believe that we need to remind ourselves about few things. While Skyrim requires Steam to work, I think this forum is the proper channel to remind most users about the matter.
Please do not upload mods to other sites or file sharing services without the specific permission from the mod author.
In worst case scenario, you do not only risk getting banned from file sharing community, but mod author(s) might see no other option than to completely pull their work away. This has happened in the past.
Keep in mind, that work that was pulled away for your actions might have acted as a parent mod for another mod(s). Those wouldn't work without it. The new location for file – if available – might not be open for everyone that wish to use it as dependency for other mods.
To that matter, please understand that not all members have – for various reasons – access or willingness to join to all communities sharing mods and resources for Skyrim. Un-legitime uploads to others sites will only spread this problem, where dependency files are not available for uploaded mods.
Please do not ask members of forums to upload mods from other sites to other forums. Do not ask other users to chop larger mods in pieces to fit them (as un-legitime uploads) another file sharing site. It is exactly the same thing than above, despite what you might wish to believe.
The most important thing:
Remember to have fun with Skyrim... ... and let others have fun as well.