Foursquare in practise for nonprofits

In the interest of practising what I preach, I’d like to share with you a project I’ve implemented at work involving Foursquare.
RSPCA Australia has a scheme called Choose Wisely:

Choose Wisely businesses serve humanely produced eggs, chicken or pork (or all three) at a Gold, Silver or Bronze level, depending on whether they use them in [...]