I came up with what was essentially Jaiku a number of years before it launched (which is funny cos Jyri is a friend now). I built specs and wireframes and was

I came up with what was essentially Jaiku a number of years before it launched (which is funny cos Jyri is a friend now). I built specs and wireframes and was beginning to plan out the backend but then lost interest after a number of investor-friends couldn't see the market for it. To be honest, I'm not sure there is a market for it but that also proves that startups don't always need a market on their own to be successful and exit.