gabrielh

You might want to use the Yelp API.

http://www.yelp.com/developers/documentation/v2/search_api

https://github.com/Yelp/yelp-api

Mark Zuckerbergs facebook user id is 4 (https://graph.facebook.com/4), so its always fun when you have a nil bug and then you think Zuckerberg is using your site.

OAuth 2 is way simpler but requires HTTPS, which may have overhead at scale.

Its important to note that if a person doesn't owe taxes directly, the probably do contribute through payroll tax. [1]

[1] http://money.cnn.com/2011/04/14/pf/taxes/who_pays_income_tax...