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Bradford Shellhammer and Jason Goldberg explain how their unloved social network for gay men became a design daily deal site with 1.6 million members.

Many of us think of sharks as lone hunters. We imagine them spending most of their lives swimming alone, briefly seeking out the company of another shark for the purposes of reproduction, then going back to their solo ways. We also tend to think of sharks as dumb machines, capable of little more than hunting

Gina Bianchini stepped down as CEO of Ning in 2010.

Some of the start-ups that made the list are no-brainers. Others might have you scratching your head.

Monday, November 14 Build a game, and they will play--and pay. Of the 62 million Americans who will log game time on a social network this year, some 10% will open their real-world wallets to buy virtual goods. That small percentage is nothing to scoff at, says Paul Verna, analyst at eMarketer.

The founder of FamiliesGo!, a travel website, weighs the options for her start-ups growth. One of the first things another entrepreneur said to me when I was getting feedback on the viability of FamiliesGo! was that I ought to think about whether I want to keep things small or “go big.” I think about it a lot and can see the possibility and appeal of both paths

A recent study showed that certain brain areas expand in people who have greater numbers of friends on Facebook . This was welcome news for online social network addicts, particularly teenagers : "Mom, I'm not just on Facebook ; I'm doing my temporal lobe calisthenics." There was a problem, though

Entrepreneur (and former Facebook employee) Dave Morin did. Here's why.

Eric Schmidt maintains Google Plus isn't in competition with other social networks; LinkedIn's Jeff Weiner isn't convinced the two can coexist. Who's right? Google Plus's overnight success has sent the tech press and Google 's competitors into a frenzy over how much market share the new social network will grab

Used to be, if parents wanted to know what their kids were up to, they’d just rummage through their dresser drawers. But now parents take advantage of social network spying solutions. [More]

The launch of the Google+ social network casts a shadow over Google's previous efforts in this arena, including Orkut, Wave and Buzz, all of which still have active Web sites.

MySpace sold to ad network, more Google+ news, small business loan troubles, and more. MySpace sold for $35 million

While working at Facebook in 2009, Adam D'Angelo and Charlie Cheever had a question: Why isn't there a place on the Internet where a question can be answered by someone who actually knows the answer? That question led the pair to start Quora , a Q&A website that allows users to share knowledge. You can pose a question, answer a question, and edit others' answers

The Fast Company reader's essential rundown of who's breaking into and shaking up your tech space--updated all day. Skanz Are Wearable Business Cards/Social Network The New York Consumer Electronic Week conference will outfit all attendees with a QR-code wristband that activities a sophisticated business card-like app called Skanz. In addition to basic info, Skanz is a mini-social network that facilitates offline interacting after the conference--in other words, no more trying to cram even more URLs and social media IDs onto increasingly tinier slivers of what was once called a business card (for more business-card ditching strategies, see our post from SXSW)

The Fast Company reader's essential rundown of who's breaking into and shaking up your tech space--updated all day. Facebook's New Photo Sharing App The new standalone app will reportedly challenge the likes of