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:

The posters were created by a 10-student group called STARS, Students Teaching Against Racism. The group’s president is Sarah Williams, 24, a senior majoring in political science. She told ABCNews.com she has been shocked by the amount of attention the posters have garnered, but is happy that they have started a national conversation.

“We wanted to highlight these offensive costumes because we’ve all seen them,” Williams said. “We just wanted to say, ‘Hey, this is not cool. This is offensive and this shouldn’t be taken lightly.’ It’s offending a culture and people should be aware.”

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?