A particular form of
Viral Marketing.
You have a science fiction movie coming out. What can do you do to promote it that goes that extra mile?
You do
In-Universe Marketing. You post "found" documents from within the universe. A
"NBS Nightly News" broadcast from 1972 in your world? Great.
Advertising a drink from your setting? Yup.
Showing a half hour of dull security camera footage with maybe thirty seconds of profoundly disturbing stuff going on? Perfect.
The diary of one of the characters, with pages torn out?
Synergylicious!
Distinct from the
Alternate Reality Game in that there is no 'game', per se. Rather, all there is is the document.
Websites that use
In-Universe Marketing are usually
Logging Onto The Fourth Wall.
Not all
Viral Marketing qualifies as
In-Universe Marketing; the product being advertised must be fictional, and the "found" document must be set in said universe.
Examples should go under
Viral Marketing; this entry just defines the term.