It is quite unfortunate to witness so many developers give up their dreams because of the ABD Syndrome. ABD Syndrome or Already Been Done syndrome is an illness where a developer discards his/her idea only after searching for its existence.
Most of the things in life have already been done! Does that mean we should stop doing those things? Love songs have been composed, action movies have been made, horror books have been written etc.
Imagine a world if every developer was thinking like that! We would not have awesome tools like TweetBot, Clear and many more!
The journey on already been done road should not be seen as a dead end but as a fork with multiple creative destinations.