I'm only just learning about b-roll, which I'll use when I vlog. Mostly, I review makeup and skincare, so I haven't found it necessary. My last vlog only ended up being 0:55, though, so I definitely need to shoot b-roll (also, it was my first time out with my camera and I was paranoid that I'd accidentally shoot people who didn't want to end up online, as it was a really packed event where I was the only person walking around with a camera (well, there was one other lady, but she was sitting in front of her and her husband's "booth", going through photos she's probably going to sell at the next event). Then I was at a pizza shop and got over myself enough to record me speaking for like ... 10 seconds. I really think b-roll would have helped, since someone I know commented that she'd have liked to see more cheesy shots, which I could have easily done by panning over some of their pizzas or something.