Interested in discovering what films you can get your hands on at Princeton? Consult this guide to find films using the library catalog. If PUL doesn't own a film, suggest a purchase or write to me directly.
Princeton also subscribes to a handful of video streaming resources: do a search for video at the DATABASES search.
If interested in finding or using data, consult the Data & Statistical Sources website, a unit in Firestone Library that provides specialized services. Refer to the University guidelines on using and posting to SM; see especially the Glossary at the bottom. See this list of SM Research Tools.
Interested in using or analyzing social media? This guide from Northwestern University Libraries provides many resources related to doing research on/with social media. Tips for finding and evaluating primary source materials can be found here.
The Chicago Manual of Style does a good job of providing examples of citing different kinds of social media platforms.
The online version of MLA provides guidance in a few different sections:
Types of social media (be strategic in what you choose to work on/with, not random):