I am interested in contest on Facebook, where he promised to win for you to become a fan and you share photos on his wall.

It occurred to me but a few questions about the regularity of the draw winners:

1. How to tell if the man also became a fan and share photos.
2. Photo has over 12,000 shares ... it will be one to describe all the names?
3. Will be included in the competition, people who were fans before a contest?
4. As the draw take place?
5. They will be included in the draw really all or just someone to choose?

What is your experience with similar competitions?
It makes sense to participate?