Ignoring the fact that the Ciel is a pure concept car that likely can't even be registered for regular use, there are more than a few things that should give this nonsense away as a hoax.
First, Eminem has only ever gotten in bed with one automaker – Chrysler. It seems unlikely that he'd defect simply to give away a car on Facebook. Secondly, the page that is putting on the giveaway isn't even a verified page – Eminem's real Facebook fan page has 97 million likes, this one has 622,000. Third, a quick look at the caption for the Ciel's photo, shown above, reveals the sort of grammatical mess that no serious contest would allow. Take a look (sic implied throughout):
We reached out to Cadillac spokesman David Caldwell just for fun. Apparently, this photo and schtick pops up every few months with virtually the same text, only to vanish at the end of the "giveaway." You're as shocked as we are, right?
"Only 24 Days Until Christmas, Can you Imagine yourself driving this Car? I'm about to make that happen, Its Official, I Will be giving away this 2014 Cadillac Ciel to one random lucky fan, all you gotta do is follow these three easy steps, Step 1) Share this photo, Step 2) Like my page, Slim Shady Step 3) Like this photo, Winner Will be picked On December 5th 4 Days Away, Good luck to Everyone!!"
So, once again folks, just because it's on the Internet doesn't mean it's true. If your friends, family and acquaintances are blowing up your Facebook feed and social network channels with this nonsense, be sure to set 'em straight with a link to this story – we're sure the real Slim Shady will appreciate it.