Facebook tried 'email' it didn't work. Google tried Google+ didn't work., or for that matter a social network. Microsoft tried 'search engine' it didn't work.
If you don't want to learn a lesson out of it, then you are purely an idiot.
Moral of the story. Stay focused on what you do best, or if you want to 'disrupt' the current market of a specific product, then you have to build the most innovative earth-shattering, ground-breaking product, that could blow the competition away, otherwise you will be beating the dead horse.
There is no room for at par or mediocre efforts in a highly competitive product marketplace.
It's not a rocket-science, it's called 'common-sense'.
