Foursquare's adoption of a game dynamic when it launched is a particularly clever implementation of a social hook.

Markets come and go. Good business don't.

Most adults I know start their Internet session at Google, and most kids I know start their Internet session at either Facebook or MySpace.

Not only do you have to put yourself in harms way in service of your country, you have to leave your families at home. It is a great sacrifice.

Given New York City's cultural diversity, it has always attracted creative people.

Many artists stick to making and hire a manager to focus on their business. Artists that build websites and mobile apps can do that, too.

The fact is that the amount of money startups raise in their seed and Series A rounds is inversely correlated with success