Je ne vais pas parler de ma start-up, je ne ferai peut être un jour quand je serai passé à autre chose, mais de ma maigre expérience je seconde très très fortement les trois premiers points de la réponse la plus votée :
1. Keeping your idea secret.
This is one of the most stupid misconceptions about startup ideas (If I tell it to someone they’ll steal it and make millions of it) Reality is that every loser has a business idea with a potential but most are not capable to execute it. And people who are able to execute ideas have plenty of their own. Of course, it’s the execution not the idea – facebook came after friendster and myspace and google came after plenty of search engines.
2. Trying to build a product for everyone.
He who tries to please everybody, pleases nobody.
3. Lack of focus.
All entrepreneurs are cursed with having too many ideas that are too tempting not to be executed. The point is to be able to put everything else aside and focus on one with best timing and most potential. Jack Dorsey mentioned somwhere that he had his Twitter idea almost a decade before he started it and put it in shelf – which is his way of clearing distractions.