My class doesn't involve a ton of reading, so it wouldn't be something I use often. I share my booksnaps with them on Instagram to encourage reading and sharing it. I could see using "book"snaps when we read an article about technology, which we do occasionally. It's a fun way of doing things ELA teachers have been incorporating forever: annotating text, close reading, finding evidence, etc. The easiest way to share it I think would be Seesaw. Kids can mark up the screenshot in Seesaw and record audio over it.