Lately, I have been thinking about few ideas for my future startup that I thought would be better if I built them. Some of those ideas were really great and as I was diving into them for some research, I came to found that their exists same sort of service already that is doing an excellent job.
My recent incident just for an example, while I was reading http://www.thedeveloperscode.com/, I got an idea for making a social network that would enable people share what they are reading, host their books if they are writer and even enable them to sell them (or let peoples subscribe by paying money) depending on their preference. And I came to know that their already exists http://scribd.com that is doing great job for this. I know it sounds silly that I wasn't aware of it and neither was using Scribd already, because I am noob from a middle class family of a underdeveloped country Nepal (Asia) where Internet is just emerging and has barely touched peoples daily life, which surely has effected me too.
My point is, what would you guys do, if you found that somebody has already built a service that you were thinking seriously from last few months? Would you just swift change your ideas? Make improvements in your idea seeing what their demerits are and what services/features they lack? Or just dive into it without caring and start building your own? I understand that their already exist Yahoo search before Google came up, Friendster before Facebook came up, and as there was already Facebook, Google+ came up.