1. I am now using Ubuntu, the most popular desktop Linux, since 2 years ago and have never gone back to Windows. It is super fast, no virus, and simply GREAT!!
2. I've been using an Android phone for more than a year now, literally the OS is built from Linux. There is simply no limitations like stupid iPhone. Whatever that you want to customize, go ahead and do it, it is your phone.
3. Linux can be used, freely modified, and redistributed, both commercially and non-commercially, by anyone. It is now everywhere!!
4. I just totally love that idea. :) (I'm a geek like that, I know :p hahaaha)