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By Chris Dannen | 02-21-2011 | 7:41 PM
First rule of hack day: have one.
Teach people about themselves.
Don't be bossy.
Use tech to make magic.
Use human brains.
Do something in real life.
Don't fear the snickers.
Befriend the competition-to-be.
A bold hack called FourPlay got groans during the end-of-day presentations, but the idea is sound: It lets anyone on Foursquare find a date nearby after trading pictures. Yes, more and more people use the Internet for sex, and in the future, it might be all they use. Innovate for next year's tastes: some hot-and-bothered tech lover will need you.