Movie fps question

Hey everybody,
I was wondering at what fps (frame per second) do you set your movies usually for a web site.
I know that it depends of your needs for the site itself but sites like 2advanced studios and all those sites which have really fast transitions etc… what speed do they usually go for?
And of course if anyone has a personal opinion on why a certain speed is better than another i’d be happy to hear many different ideas.

thanks