'If you're not paying for something, you're not the customer; you are the product being sold.' -- Andrew Lewis, under the alias Blue_beetle, on the site MetaFilter
In the era of social media, we all enjoy using social networks for personal or professional reasons. Facebook seems like the ideal network. Everyone is using it. Communication gets easier than ever, borders have disappeared and the world feels closer to you. You're even more excited by the fact that everything is in your own hands for free, without paying for its use. Is it so? Is it really free?