They are pretty much interchangeable, just just drop them in response to any mindless religious post. (religion.blogs.cnn.com)
This puts the incentive on teams to try to kick it out of the back rather than on dropping it on the 3 yard line and playing to stop them before the 25. (sbnation.com)
It is important to use them in a way that makes sense, so don't just drop them in without thinking it through. (flexjobs.com)