There's no need to explain that bullying is horrible, but the problem might be worse than you realize. Kids who witness bullying are more likely to struggle with problems like substance abuse and truancy even if they're not bullied themselves, so the issue radiates well beyond the individual young people who experience abuse.

A new initiative that launched in late October hopes to give those witnesses a simple way to express themselves and shut down bullying as soon as it starts.

Dubbed "I Am A Witness," the campaign is a collaboration between major tech companies and marketing agencies. Its logo, a simple icon depicting an open eye within a speech bubble, has already made its way into your iPhone's emoji set, though you might not have noticed it yet: