I have been freeing up space on my macbook. I have about 6 projects on my iMovie project tab. i posted/shared all of these to my Facebook and youtube.. what i didn't know is that when i deleted them from my projects, it also deleted them from my youtube and Facebook without saying "if you delete this it will be removed from your shared sites"

my question i guess is:
How do i delete my projects to free up space WITHOUT taking them off my youtube and Facebook.
please help.
my question i guess is:
How do i delete my projects to free up space WITHOUT taking them off my youtube and Facebook.
please help.