Sharing is good, and with digital technology, sharing is easy.
The idea of copyright did not exist in ancient times, when authors frequently copied other authors at length in works of non-fiction. This practice was useful, and is the only way many authors' works have survived even in part.
The reason that a good citizen does not use such destructive means to become wealthier is that, if everyone did so, we would all become poorer from the mutual destructiveness.
Facebook is not your friend, it is a surveillance engine.
Android is very different from the GNU/Linux operating system because it contains very little of GNU. Indeed, just about the only component in common between Android and GNU/Linux is Linux, the kernel.
Proprietary software tends to have malicious features. The point is with a proprietary program, when the users don't have the source code, we can never tell. So you must consider every proprietary program as potential malware.
A smartphone is a computer - it's not built using a computer - the job it does is the job of being a computer. So, everything we say about computers, that the software you run should be free - you should insist on that - applies to smart phones just the same. And likewise to those tablets.
Free software is software that respects your freedom and the social solidarity of your community. So it's free as in freedom.
The idea of free software is that users of computing deserve freedom. They deserve in particular to have control over their computing. And proprietary software does not allow users to have control of their computing.
Many users of the GNU/Linux system will not have heard the ideas of free software. They will not be aware that we have ideas, that a system exists because of ethical ideals, which were omitted from ideas associated with the term 'open source.'
Also, because schools must teach the spirit of goodwill, the habit of helping others around you, every class should have this rule: students, if you bring software to class you may not keep it for yourself.
I could have made money this way, and perhaps amused myself writing code. But I knew that at the end of my career, I would look back on years of building walls to divide people, and feel I had spent my life making the world a worse place.