#LevelUp is a trending hashtag on TikTok where users of the app challenge themselves (and sometimes their furry friends), to see how high or far they can jump over a stack of small objects.

A viral trend on Instagram has people posting embarrassing pictures of themselves with the caption #UntilTomorrow to trick others into liking the post so that they qualify as the next person of the online chain.

Internet challenges can be entertaining, absurd, dangerous, and tools for positive change. What they have in common is how they combine elements of active participation and online sharing.

A multiplayer live-trivia game where users have the opportunity to win money.

The #TrashTag Challenge has people around the globe cleaning up the environment and sharing “Before” and “After” pictures to show-off their efforts.