Monogamy.. does it exist online?

There has to be something said about people who believe in one person for one person. If you are eager to have something special with someone and that question gets asked and agreed upon it should be held as law correct? Or does that only apply in real life?
Re: a friend has a b/f (online) and is chatting it up with others online. Creating what she calls friendships. Because I know her I know she is just keeping someone on the back burner just in case...