Twitter announced the shutdown of their video app, Vine, today (see Whither Vine? from The Atlantic).
Vine’s six-second “stop-action” looping videos were innovative at first, and I used them regularly in the classroom. However, then Instagram added a similar, but longer (initially by a few seconds, and now by a minute) feature that allowed the stop-action ability and, for school-purposes, at least, I never looked back.
You can see lots of examples at The Best Resources For Learning To Use The Video Apps “Vine” & Instagram.