The easiest way is to download videos that are associated with bitcoin then we share to social media teenagers or children, I'm sure with the video then bitcoin is easier to understand.
I think these videos are rather boring than interesting for teenagers unless they're animated or funny.. Teens are watching fun videos, not educational ones most of the time. For example, BuzzFeed always does great videos because they are interesting, educational, fun and animated. This raises up the curiosity for teenagers.
Kids loves playing games and there are many bitcoins related games available nowadays so in that case they will also have fun of playing and at the same time they can also earn some money so I think this can be the best way to motivate or educate kids about the bitcoins.