In all the ages information (knowledge) is one of the most valuable assets of human being. Throughout our lives we have many sources of knowledge. Wikipedia will be one of those information source mutual for majority of the people.

Wikipedia zero is an initiative by Wikimedia foundation provides free access to Wikipedia on mobile devices (without data charges) in developing countries.

Objective:  "to reduce barriers to accessing free knowledge"

WP Zero is already active since 2012 in many developing countries and has provided free access to almost 230 million mobile users around the world.

Wikipedia The worlds largest community-written encyclopedia is no doubt a great source of information with more than 4M articles in English only and an overall 5.7+ B visits a year.
The most interesting thing is Wikipedia is a Non-profit organisation under WikiMedia which survives purely on donations.This online encyclopedia collected $20M in 2011 with Google as its biggest contributor of $2M. In 2012 it raised tp $25M.
Do you want to know what are the most viewed articles in 2012 ?
Here are the top 10 viewed articles
Page name                              View count
1. Facebook                             32,647,942
2. Wiki                                    29,613,759
3. Deaths in 2012                     25,418,587
4. One Direction                       22,351,637
5. The Avengers (2012film)      22,268,644
6. Fifty Shades of Grey             21,779,423
7. 2012 phenomenon                20,619,920
8. The Dark Knight Rises          18,882,885
9. Google                                 18,508,719
10. The Hunger Games             18,431,626
Here is a list of 100 articles Toolserver