Waste not, want not

I've got to be honest. I had no idea what I was going to write about this week. Until just now.
I just remembered a comment someone made on another social media site. The person who made it did so in the midst of a rather heated conversation about the use of books (that an interior decorator had purchased by the yard to style a beautiful set of built-in floor-to-ceiling bookshelves). The comment that sparked my anger was something completely idiotic like: "I don't understand why some people keep the books they do. Once you've read it, you've read it."
Of course I couldn't let that go. And of course it warranted a snarffy response. Of course I delivered one.
I said, in no uncertain terms, that the comment was a deep, profound, insightful testament to the stupidity and wastefulness of a throw-away society. Or something like that.
I added that I certainly don't keep every book I read. But those that I do keep are well-read. And every time I re-read them, I find something new on every page.
How about you? Do you keep all of the books you buy or just some of them? What are your criteria for keeping books? What are your criteria for giving them away?
What do you do once you decide you no longer want them? Do donate them, trade them in at a local book swap, or relegate them to the recycling bin?
Let me know... It might make some interesting fodder for future blog.
But it's late so I'd better sign off for now.
Until next time, "That's life..."