Head over to the Facebook pages of Amazon’s specialist sites, Soap.com, Diapers.com, Wag.com (pets) and YoYo.com (toys), and you get to vote for which brand you most want 30% off during the upcoming US national shopping days, Black Friday (11/25) through Cyber Monday (11/28). Nice way to stimulate demand with a demand-driven deal app.

Users get to vote between two options (e.g. Cover Girl vs Revlon) ten times in this ’Battle of the Brands’ Facebook app, with the brand with the highest total amount of votes offered with a 30% discount 25-28 November.  We like the extra incentive to share the app – if shared 1000 times, Amazon donate $1000 to the Red Cross, and if shared 2,500 time, $2,500 will be donated.

This is simple and smart social commerce.  One to emulate?