contractions are usually only taboo in academia. Further, contractions are common in nearly every other type of writing we are exposed to, from novels to newspapers and blogs. Not doing contractions would be a sudden change, not a jarring one, but a change that attracts the eye and slow the momentum of reading. I have not written in contractions here, have you noticed? If so, there is your answer. As long as the most egregious errors, such as its and it's being mistaken there is nothing wrong with contractions.