It sounds like a sweet deal: report your location to a social network and get a coupon for discounts and prizes. The price? The possibility that advertisers and other third parties will know where you are and where you've been.
A recent survey by the Pew Center's Internet & American Life Project found that only 4 percent of Internet users have adopted location-based services, as Cecilia Kang reports on The Washington Post's Post Tech blog. That survey was conducted in August and September, before Facebook and Yelp joined Foursquare and Gowalla in offering coupons to users who … Read more