Yep. At first I was doubtful of the need to cite facebook & twitter, but with government (federal, state, & local), campaigns, newspapers, corporations and other entities using social media I do see the need. Though, as a historian, I wonder when the Chicago Manual of Style (Turabian) will tell us how to cite these sources. I haven’t found that format yet.
This was in the Chicago Manual Style’s Q&A about Twitter. Haven’t seen Facebook though I suppose it would be around the same concept:
Q. How do I cite a Twitter feed in a footnote? Do I cite the website with the whole feed or mention the date of the particular tweet I’m interested in? Do I list the author’s real name or just his Twitter handle? Thank you!
A. In the text, you can incorporate the facts into a sentence: In a Twitter post on September 14, 2011, Garrett Kiely (@gkiely) wrote, “Using Google, Authors Guild takes 2 mins to connect an author with an ‘orphaned work’: bit.ly/nqyjOo.” And here’s a possible note form: