MLA treats these types of resources as Nonperiodical Web Publications.
Author/editor/producer last name, first name (if available). "Title of work." Title of website. Publisher or sponsor of website (N.p.if not available), Date published. Web. Date you accessed the video. <URL (optional)>.
AsapScience. "What If You Stopped Sleeping?" YouTube. Google Inc.,
22 Sept. 2013. Web. 25 Sept. 2013. <http://youtu.be/nNhDkKAvxFk>.
"Eyewitness describes Kenyan mall tragedy." CNN.com. Cable News
Network, 23 Sept. 2014. Web. 25 Sept. 2013.
"Gun Rights and Starbucks; Library Awards; Miss Manners." The Brian
Lehrer Show. WNYC Radio, 19 Sept. 2013. Web. 25 Sept. 2013.
Author's last name, first name. "Subject Line." Message to the person to whom it was sent. Date sent. E-mail.
Jones, Rachel. "Re: Views on Post-Recession Economy." Message to Robert
Ross. 18 Sept. 2013. E-mail.
User's last name, first name (Twitter username). "Tweet." Date of posting, time of posting. Tweet.
Angelou, Maya (DrMayaAngelou). "I’ve learned that whenever I decide
something with an open heart, I usually make the right decision."
6 June 2013, 1:45 p.m. Tweet.
MLA has yet to publish guidelines for citing social networking sites. We would suggest following the format given for citing an entire web site, but use the display name first, with the real name in brackets if known.
Author, editor, compiler name last name, first name (if available) (Facebook display name if different from name). Facebook. Web. Date of access. <URL (optional)>.
American Humane Association. Facebook. Web. 24 Sept. 2013.
President Bill Clinton [Bill Clinton]. Facebook. Web. 24 Sept. 2013.
Author, editor, compiler, or screen name (if available). "Posting Title." Name of Site. Name of organization affiliated with the site (when applicable), posting date. Web. Date of access.<URL (optional)>.
Beavan, Colin. "Is Progress Good or Bad?" No Impact Man. 21 July 2011.
Web. 24 Sept. 2013.
Granny21. "The Best Knitting Yarn." Knitting & Crocheting Message Board.
HGTV, 5 May 2012. Web. 24 Sept. 2013.