This is an interesting one on where do you draw the line. Do you need permission from the maker of EVERY piece of clothing worn for instance... no.
So Clothes - fine
Mondeo - fine
Facebook on a computer screen - no chance.
Strange.
OK so in this horror movie I am currently making (www.thehallowedmovie.com) we need to show close ups of a couple of Facebook profiles. These wont be real persons profiles just mocked up ones for the characters in the film.
Would Facebook be able to pull us up on showing their website on screen...