Genealogical citations seem to me to be useful only if the cited source can be revisited, That means Facebook postings, like conversations, interviews, chalk-board presentations or lectures, need to be captured in some more lasting form before they are used, and the citation should be to the lasting form, rather than the ephemeral original. Donn Donn Devine, CG Wilmington, Delaware, USA CG and Certified Genealogist are service marks of the Board for Certification of Genealogists, used under license by board certificants after periodic evaluation, and the board name is registered in the US Patent & Trademark Office.