Ahead of a key decision by India's telecommunications regulatory body, Mark Zuckerberg wrote a blog post in the Times of India to defend his nonprofit Internet.org, which provides free (but limited) Internet access to under-served areas.  The service is called "Free Basics," which enables users to access the Internet but only for a limited number of apps, such as weather, Wikipedia, and, yes, Facebook. Other app developers can apply to Internet.org to be included in Free Basics.   

In April 2015, Mark Zuckerberg visited India to help promote his nonprofit Internet.org's efforts to provide Internet access to the billions of people around the world (two thirds of the world's popoulation) who still lack Internet access.  The nonprofit provides a smartphone app with free Internet access that is limited to several programs, including Facebook (minus the ads): "The Internet.org app provides free basic services in markets where internet access may be less affordable.

Mark Zuckerberg visited Colombia and President Juan Manuel Santos to launch a free Internet.org app for smartphones that will enable subscribers of local phone service Tigo to get free Internet access to a limited number of free services, including Facebook and several government sites such as "Instituto Colombiano para la Evaluación de la Educación, an education assessment service and Agronet, a service that provides information on agriculture and rural development."  The list of free services includes:

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24 Symbols
AccuWeather
Agronet
BabyCenter & MAMA
Facebook
Girl Effect
Instituto Colombiano para la Evaluación de la Educación
Messenger
Mitula
Para la Vida
Su Dinero
Tambero.com
UNICEF
Wikipedia
YoAprendo

Mark Zuckerberg and Facebook helped to start a cooperative effort among telecoms and Facebook to provide free Internet access to countries that lack it.  This initiative--called Internet.org--just launched an app for people in Zambia that provides limited free access to  Facebook, Facebook Messenger, Google, AccuWeather, Unicef, job search sites in Zambia, and women's health and rights organizations.  (More here.)