PSFK one of the best sites on marketing technology mentions our extensive use of beacon technology to allow location based winning of branded giveaways.
http://www.psfk.com/2015/03/clai...
I definitely recommend checking out Claim it! if you love free stuff and are in NYC. We're working hard to roll out more cities this year. We're doing some very interesting things with proximity tech, location context and product giveaways. People can't believe we're giving away free stuff, not as a marketing strategy but as the business model. You can check us out on Instagram @claimitapp if you want to see all the photos of the thousands of happy winners.
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Golden Kitty Awards 2016
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