No one can see or access your snippets or mashed videos unless you share them. If you don't upload your videos to a social network or cloud service, share a link, or email them to someone else, they're only stored locally on your device within your Photos app.
Our Instagram account showcases videos posted by our users using the #1SEme hashtag or videos made by our team. These are only visible to us if our users have a public Instagram account. So, don't worry! Nothing will be shared or seen by others unless you want to.