Sam Altman

Traditional local advertising is not what retailers want. They want not just for you to see an ad - they want you to come into the store, to be a repeat customer and to spread the word.

Location is the sole difference between mobile and traditional Web.

I don't think people spend nearly enough time thinking about what they like and what they're good at.

The biggest part of Loopt is about discovering the world around you, never replacing a social experience - only adding to it.

If you ask a founder how their company is doing, they always say, 'Oh it's great. We're totally crushing it,' and that's almost never true.

If the Reddit community cannot learn to balance authenticity and compassion, it may be a great website, but it will never be a truly great community.

Virgin America flyers tend to be more likely to be using a mobile device and tapping social networks - even at 35,000 feet.

Never put your family, friends, or significant other low on your priority list. Prefer a handful of truly close friends to a hundred acquaintances.

Facebook and Instagram are spiritual brothers.

The start-ups that do well are the ones that are working all the time.

Very ambitious startups often take a long time to work - or sometimes they take a very long time to look ambitious.

The crowd's a really powerful force on the Internet, and people finally understand how to harness that.