Yes, I do have one. I don't write in it everyday or anything, but I write in this notebook once in a while. I used to write in it all the time when bad things happened and when I was feeling especially down about myself lol, but then I remember reading a book about shyness that said you shouldn't just write down the negatives, which makes complete sense lol. So I've written down positive social interactions as well.
Do you keep one, yourself?