Here are the rules:
Who: Open to anyone in the world 18 years old and over.
What: One lucky winner will receive a Sigma 35mm f1.4 lens along with a Sigma USB dock.
When: 12AM EST September 6th to September 20th 11:59 PM EST
Where: Click this link to head over to our special Facebook page
How: Enter in your best landscape photo. Users can choose to have their friends vote on the image. The Phoblographer and Sigma will not use the image in any way except to announce who the winner of the contest is. Additionally, we will need your email address in order to tell you that you’ve won and to sign up for the latest news from Sigma.
The photos for the contest are run through an external app called Woobox, which you can see in the link. The platform runs through Facebook, but it isn’t really on Facebook.
With that said, you aren’t uploading your images to Facebook, you’re uploading them to Woobox.