Infonesia is an inability to remember where you saw or heard an item of information. The condition is usually temporary but can recur frequently. It is more common in "information societies", with their flows of e-mail , seasonal catalogs, personal digital assistant s, and trial magazine subscriptions. Possibly the most pernicious form of infonesia is internesia , the inability to remember which Web site you saw an item of information on.
A person who is racking their brain to remember the information source could properly be termed an infonesiac, although this usage is not common.