Here’s a video campaign done by British health organization NHS. It’s done by letting users/youtube viewers choose which direction to take at a certain point in the video. These decisions obviously will affect the outcome of the viewed youtube clip.
I’m going to paste in here what the creators of the clip are saying about it:
‘Condom, no condom?’ allows viewers to direct the storyline and shows the consequences of using or not using a condom.
The film, which is on YouTube, follows a group of young party-goers and at different stages of their night out the viewer is prompted on whether or not to choose a condom.
Each choice leads to another short film showing the consequences of the decision, including pregnancy, sexually transmitted infections and rejection by a partner.