It's so funny that we fall into that trap, because Google and Facebook both usurped previous services in their domains. What's interesting is that there is a di

It's so funny that we fall into that trap, because Google and Facebook both usurped previous services in their domains. What's interesting is that there is a different category of ideas that is just "Facebook but slightly different" that genuinely won't succeed - but people tend to pursue those ideas more frequently, because they have seen proper execution lead to success, often missing that the proper execution was what mattered, not Facebook as an idea.