Reference: Poster Last Name, First Name (or User name). "Title of Post." Type of Post. Facebook Page Owner. Facebook, Date Posted, Location/Link.
Example: UCD Students' Union. "We support the call tonight to #Take200 vulnerable young people from devastating scenes in an at breaking-point Calais camp. This is happening, we have to act - #NotOnOurWatch." Facebook Students' Union of Ireland. Facebook, 3rd Nov. 2016, "https://www.facebook.com/plugins/2F10153784831161910.