Pay them. College students will do anything for money, even if its a small amount. Try out a survey. My campus has a lot of those surveys posted on bulletin boa

Pay them. College students will do anything for money, even if its a small amount. Try out a survey. My campus has a lot of those surveys posted on bulletin boards and usually participants get something like $10 for completing a survey, or even better, they just get an entry into a contest for an Ipad 2 or something.