Where to Promote Giveaways?

My company is having a giveaway for this Pokemon Go stuff and need a place to post for exposure.

What are the best methods to getting people to sign up?

Reddit isn't too great since they destroy spam, social media has been tapped out.

Thanks

https://www.incipio.com/power-to-catch-em-all

There are many sites devoted to this for you to list your giveaways, just search google for "sites to list your giveaway"