OWL is a GREAT site for additional questions you have about all things MLA!
From The MLA Style Center
Note: If you are using a screenshot of a tweet in your paper, you label it "Fig.1" (or 2, or 3, and so on) and then follow that with the whole works cited entry of that Tweet. if the Tweet itself is very long you can use the first 3-5 words of it, but the entire tweet would be in the works cited entry.
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