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Foursquare's Dennis Crowley on Building a Massive Community

The mobile and social technology trendsetter talks about blazing a path to the top.

If you've "checked in" to an urban hotspot, say thank you to Dennis Crowley, the 36-year-old co-founder of location-based social tool Foursquare. We sat down with Crowley to discuss what makes a tech startup great.


 
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How to Make Your Website Hacker-Proof

Each day, Google identifies 4,000 legitimate sites that have been hacked. Don't be one of them.

Hackers are constantly breaking into innocent websites and using them to infect visitors with malware, lure them to dodgy sites and infiltrate databases to grab sensitive customer information. Here's what you can do to avoid trouble -- or eliminate it quickly.


 
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Web Gang Operating in the Open

The Koobface gang broadcasted it location on Foursquare and Twitter

Five men believed to be responsible for spreading a notorious computer worm on Facebook and other social networks — and pocketing several million dollars from online schemes — are hiding in plain sight in St. Petersburg, Russia, according to investigators at Facebook and several independent computer security researchers.