When someone shared your video via email, the default text is:
Check out the amazing video here
This text could be better. I'll think about improving it. The great thing about this sharing text is that it's completely customisable. The place to go is general preferences:
Once you're there you'll find an option called "Sharing Text". You can change that yourself.
If you have any ideas on how we can improve video sharing, don't hesitate to let us know.