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Now Available: Innovators Under 35 2013 See The 2013 List »

Stewart Butterfield, 32

Building communities through photos

Flickr (Yahoo)

In February 2004, Stewart Butterfield and his coworkers at Ludicorp, then engaged in developing an online game, launched a side product called Flickr -- "kind of on a lark." By summer, the project had taken over the company; today its the Webs fastest-growing photo-sharing site. Employing "tags" that allow people to make their photos searchable by content, Flickr encourages users to engage in discussions about their pictures. Acquired by Yahoo in March, Flickr now has more than one million users, who post hundreds of thousands of new photos a day.

2005 TR35 Winners

Parham Aarabi

Sharpening a computers listening skills

Regina Barzilay

Teaching computers to read and write

Stewart Butterfield

Building communities through photos

George Candea

Protecting software from crashes

Bryan Cantrill

Tracing software in real time

Andy Carvin

Bringing Internet power to the have-nots

Narashima Chari

Setting the mesh networking standard

Bram Cohen

Upending the file-sharing world, bit by bit

Dennis Crowley

Moving online socializing into the streets

Tracey Ho

Scrambling bits for a more efficient Internet

Samuel Madden

Simplifying wireless sensor nets

David Pennock

Predicting the future of markets

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