Wikipedia is a free-content encyclopedia project that is written collaboratively from users all around the world.

The primary way that Facebook makes money is through advertising.

Wikipedia is a non-profit, which means that it earns money from donations.

WhatsApp earns money by charging for subscriptions. 

The amount of applications that are available on smartphones and mobiles these days are constantly increasing. However, there are few apps that people should know about that can come handy such as DropBox and Google Keep. 

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