Wasn't sure where to post this, hope it's in the correct category. To help create content on the product pages of my video game eCommerce site I was thinking about running a contest where the entrants would write / submit a review / rating of a game on my site 30 words minimum, after say 2 weeks I would randomly select a winner from a list of review authors who would receive a prize (around £50 value). I would then promote the contest through social media etc. Has anyone done this? Is this totally legal?