I was used in 1812,
I am in the title of the fourth.
Flash! Fuji is my competitor
And you may have seen me on websites that allow the user to talk about books.
I'm a rapper and you can shoot me.
Sorry if certain lines seem to be misleading. Also, (shocker!!) no obscure book or movie references. I'm not sure of the wordplay tag... But we'll only know if it fits when you've solved it.