There's a large difference between the entertainment industry and the web application industry. Since the beginning of inventions, people have been crossing seemingly unrelated things to discover beautiful new insights. Because we create value, if "The Facebook of Wikipedia" is valuable, then it's safe to describe it in those terms; in fact, it's safe to come up with entirely new products in those terms.
However, you should note that you probably won't be creating / riding the Next Big Wave by crafting new things in terms of existing things.
Originality is not, in itself, valuable in many markets. It's often a liability.
So maybe it's more true that originality hurts. That is, you don't want to be as original as possible, you want to be only as original as you can afford to be.
Joe Kraus's stellar lecture at Startup School last year explained this pretty well.
However, you should note that you probably won't be creating / riding the Next Big Wave by crafting new things in terms of existing things.