A geisha. A terrorist. A woman in blackface, wearing a wig and a chain.

The posters depict Halloween costumes. The students who created them say they're offensive -- and all too common on college campuses.

The ad campaign by a group of Ohio University students is spreading online and has been featured by national media. Each poster says, "We're a culture, not a costume. This is not who I am, and it is not okay."

According to ABC News:

Students, what do you see during Halloween on your campus? How common are offensive costumes? Where do you draw the line between what's offensive and what's appropriate?