The sponsor of this already made a thread here:http://www.fractalforums.com/competitions-and-contests/cd-cover-contest/
Kind of a useless effort for those of us who shun facebook (and those who shun google too) (like me
Sure, entries can be emailed, but if you have facebook blocked because of their intrusive policies (google's are actually worse!) the most you can do is email a piece of Art to somebody you don't know and will be unable to track the contest or even vote in it.
If you are into those sites, have fun! I just can't see promoting a contest here that is dependent on evil places like facebook (and google) that make their money by invading your privacy, and tracking everything you do online, so they can target advertising to your online activities.