Another point I'd like to raise - If you're not introducing any new technology (just a new platform), then creating a new website or app is like starting a 'people movement.' You are actually aiming to change the culture and the way people interact with each other. When you're doing this, great programming, clear UI/UX, and a smooth functioning website are extremely important. At the same time, building the 'movement' requires passionate, charismatic, and outspoken business co-founders that can inspire others with their presence, writing, and speaking.
Absolute genuis, @rohitkumar. Thinking back to the famous Betamax vs VHS tape technology, it wasn't the best tech that won, it was the easiest to implement. Websites/platforms are the same: the winners will be have the most elegant front facing solutions (graphics, ease of use, marketing/promotion as you note) not necessarily the most elegant back end or process solution.
