To test out youtube, I uploaded two things I've done in Flipbook.
A doodle I've been working on during things like commercial breaks, or before bed. And my first animation using all that I could from the app.
After they were on Flipbook.tv, I right clicked and saved as on the download link in the edit page. Went to my youtube account and uploaded those .mp4 file.
Here's the doodle I was working on, a chase scene, landscape:
http://www.youtube.com/watch?v=dqnS40EV6iw
That one above is pretty simple when it comes to tools. I just kept the brush size the same, didn't use much color. Left the default dark background on. But you'll notice how I made use of duplicating frames, so I didn't have to redraw the entire scene here and there. Or how I used drag to move shapes for some animation at a fraction of the time. I zoomed here and there to help with the truck, seeing how at times my entire finger was the size of it.
EDIT: I'm waiting for the 2nd one to process on youtube, this one is portait, so I wanted to see how it handles it.