It's hard to overestimate how much the perception of the quality of the V.C. firm you're with matters - the signal it sends to other V.C.s, to potential employees, to customers, to the tech press. It's like where you went to college.

Silicon Valley is the engine for wealth creation. They've displaced energy, they've displaced financial services, and if we don't start including a broader array of people in that, the same group of people is going to rise to the top.

You can take a team of absolute all-stars in terms of their native abilities, but if they are not working together, they are much less effective than a team where there is less native ability but a higher degree of teamwork and cohesion.

You have to figure out what conversion means in your case. What does retention mean? What does activation mean? For every business, it's going to be slightly different because of the nature of the product and the kinds of people who use it.

Flickr was designed partly to market itself. There are a lot features, in place early on, that let people take their photo, upload it to Flickr and post them elsewhere, on their own Web site or their blog, which meant a lot of incoming links.

Hard numbers tell an important story; user stats and sales numbers will always be key metrics. But every day, your users are sharing a huge amount of qualitative data, too - and a lot of companies either don't know how or forget to act on it.

Email has the virtue - sounds like a bad thing, but it's the virtue of being the lowest common denominator messaging protocol. Everyone can have it. It can cross organizational boundaries. No one owns it. It's not some particular company's platform.

I learned so much in the year after Flickr was acquired. People forget, but Flickr launched in February 2004. And a year later, the deal was done with Yahoo, and we closed it in March of 2005. It was really independent for a relatively short period of time.

I feel like the business side came more naturally to me along with the product design side, but managing and effectively leading large organizations of people is something that is perpetually challenging and the topic on which I am constantly looking for good advice.

There's a lot that's wrong with the way we work - bad habits that develop around control of information, people hoarding information as a means of preserving their own power. When you're using Slack, everyone can see what's going on because the default mode is public.

One of the advantages of something like Slack is that I tap on the app icon, and it's just the people at my company and just the people I work with. There's a strong boundary there which aids in comprehension. It's one less molecule of glucose in my brain to manage it all.

I have a couple of things I do to clear my head when I need it. The first is exercise, the kind of exercise that makes me lie on the floor afterward gasping for breath and wonder if I'm actually going to be able to breathe enough to not die. The other one is playing music.

I no longer file expense reports, so I no longer experience the pain of it. What if everyone had a virtual assistant to do that kind of effort... like approving time off or submitting time-off requests? We want to really encourage developers to create cool things for Slack.

We sent our user research team out to sit with customers for periods of time and get some insight into how Slack is working. We also get tens of thousands of points of contact via Twitter and our customer support ticketing system every month and can synthesize those results.

For the first five years of my life, I grew up in a log cabin in coastal British Columbia in a very small town, like 300 people, mostly hippies. No running water, no electricity. When I was 12, I changed my name from Dharma to Stewart. At that age, you just want to be normal.

From the outside, Yahoo was extremely successful. It was making money; it was still bigger than Google. But when I got there, I learned what a disaster of a company looks like from the inside. There were a lot of vice presidents, and it was basically a turf battle between them.

I think there's a deep impulse in most humans to do creative stuff, whether that's music or art, photography or writing. Most people at some point in their life say they want to do something creative - they want to be an actor, a director, a writer, a poet, a painter or whatever.

One advantage that I think Slack has for most people who use it is, you pull out your phone, you look at the home screen, there's the Slack icon. You know when you tap this one, it's all the people you work with, and it's only the people you work with. And that's a big advantage.

When we first started Glitch, there were four co-founders of the company. We built Flickr and worked together at Yahoo and then started Tiny Speck. We were split in Vancouver, New York, and San Francisco. So we used an old chat technology called IRC. Almost nothing went through email.

Inside a company, you can mandate that everyone use the same technology, which means you can go a little bit, I don't know, higher-fidelity than the lowest-common-denominator technology. There are a lot of things that Slack gives you that email doesn't when you think about internal use.

I see all kinds of people work hard all over the world, and some of them are barely making it. I don't just mean subsistence farmers. I mean people in the developed world who work multiple jobs, and because the cost of health care and child care eats up almost all of the living they make.

If you work at a 10,000-person company, and you're using e-mail as the primary means of communication, then you probably have access to a couple hundredths of 1 percent of all the communications happening across the company. But if you use Slack, you might have access to 10 or 20 percent.

About 80 percent of the photos on Flickr are public and searchable by everyone. In one sense, it's a place where people upload snapshots from the family reunion, wedding or the birth of a baby or something like that, but it's also a place where people go to show what the world looks like to them.

We'd never make Slack an email client, but it's good to support sending emails into it. There's quite a bit of formatting you can do. When I get an email from the outside world that I want to share with team, I cut and paste it into Slack. But really, I should be able to import that email as an object.

Email is the lowest common denominator. It's the way you get communications from one person to another. There isn't really an alternative. Sometimes people will have Facebook messenger turned on, but 99 percent of the time, if you're sending a message to a human you don't know well, you're using email.

I think tech lives inside of a society that still has a lot of systemic racism and doesn't stop at the boundaries of the tech industry. But neither is it especially exacerbated by being around technology. But it is maybe exacerbated by the irrational decision making of people who are trying to make money.

There was a lot of dialogue between the people who were developing Flickr and their users to get feedback on how they wanted Flickr to develop. That interaction made the initial community very strong, and then that seed was there for new people who joined to make the community experience strong for them, too.

I don't think it ever occurred to me that I wouldn't be an entrepreneur. My dad became a real estate developer, and that work is usually project-based. You attract investors for a project with a certain life cycle, and then you move on to the next thing. It's almost like being a serial entrepreneur, so I had that as an example.

The scale of revenue growth is unprecedented. If you look back over history, whether you're looking at the railway robber baron era or the 1920s or the '50s or the '70s, it used to take a long time for a company to get to the point where they had tens of millions of dollars of revenue. It was almost never an overnight phenomenon.

I remember working with a guy named Andrew Braccia at Yahoo, and Yahoo was the company that bought Flickr. Everyone on his team was hard working and reliable, did what they said they were going to do, on top of everything, and seemed to be operating at this level of productivity and effectiveness that I found difficult to manage to.

One of the biggest lessons I've learned is that there has got to be a reason for what you're doing. You actually have to care about what you're doing. The business has to be about something. Whatever the point of it is does not have to be inconsistent with making money, but usually if that's the sole reason, it is not very successful.

You may be trying to drive in a particular direction that people don't necessarily understand at first. In our case, we knew the users we had in mind for this product. So in the early days, we looked at our customers, really just testers at that point, and we paid extra attention to the teams we knew should be using Slack successfully.

I was born in a little town called Lund in British Columbia. It's like a fishing village. My parents were hippies. They tried to live off the land, so I grew up in a log cabin, and we didn't get running water until I was 4. The next year, we got electricity. Then we moved to the city, Victoria, British Columbia, so I could go to school.

Some people will know exactly what they want to do at a very young age, but the odds are low. I feel like people in their early- to mid-20s are very earnest. They’re very serious, and they want to feel like they’ve accomplished a lot at a very young age rather than just trying to figure stuff out. So I try to push them toward a more experimental attitude.

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