[mslipper]

True. Perhaps 'services' or 'social networks' might be better words?

[cocoflunchy]

I think your headline doesn't work very well because it doesn't describe the actual process : you say

"Pick your favorite sites. Take a video. Swipe to share."

And what I would do is more like :

Pick a video I've made / Make a video > Slide to the site I want to send it to.

Or maybe I just haven't understood the process at all ^^