Citing Tweets
Dr. Drang on the MLA Handbook:
The first problem, though, is the more important one. The purpose of citation is to show the antecedents of your work. And not just to show them—they must be shown in a way that allows others to look them up and check whether you’re quoting or using the references properly. The information in an MLA tweet citation doesn’t provide enough information for a researcher to find the tweet being cited.
