Many are in phone/iPad app versions so they can be done on the fly:
So far, I've found Animoto (app) easy for a quick slideshow. Ripl (app) is less intuitive but more professional looking. WordSwag (app) is lightning fast for a quick pic with text ads. But for me, Canva and PicMonkey have been excellent. I mostly use them on my laptop, but they also have app versions. They're easy to use with a short learning curve and well worth the reasonable charge for the paid versions. Here's a quick ad I did on Canva this morning. It's not fancy or slick, but it gets the job done (list building). Bing. Bang. Boom.
Enjoy! And let me know what you're using for social media, ads, vids, etc!
CLICK HERE TO SHARE, LIKE OR COMMENT...and Thank You!