I wouldn't agree with "but not use it". I tend to explain the difference as being that Open Source places the freedom of people first (e.g. with a BSD licence,

I wouldn't agree with "but not use it". I tend to explain the difference as being that Open Source places the freedom of people first (e.g. with a BSD licence, developers have freedom to do anything with a piece of code) and Free Software places the freedom of software first. (I don't project any moral judgement of either of these goals, I think they both have their place. Also hi! ;)