Can you sell books on Facebook? Can I?

I received a lot of excellent advice about marketing my books a year ago (thank you Science Fiction and Fantasy Writers of America) but much of it boiled down to this. Concentrate on Amazon and Facebook ads and stop trying to do everything everywhere else. I liked the simplicity of it. I bought the recommended

Time Traveler looking for a Good Time

I truly appreciate the friends, relatives and strangers who for one reason or another have read through my novels before publication and offered suggestions and back-up proofreading. After I published c3 I came upon a way to say thanks. I made t-shirts. It seemed like kind of a goofy thing to do, which I suppose