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Nothing to see here, Mark Zuckerberg...

New research is adding a Twittery flavor to the old adage "birds of a feather flock together," because it suggests happy twitterers tend to aggregate. Does this have implications for PR-related tweeters? In a paper titled "Happiness is assortative in online social networks," University of Indiana researcher Johan Bollen and other authors conclude that "Social networks tend to disproportionally favor connections between individuals with either similar or dissimilar characteristics.

%excerpt% Read this article: PGT’s by the numbers: Is Tiger coming around?

Some of SXSW's hottest startups say they're here to help small businesses compete, but eBay execs say those merchants want something else entirely. You'd think that wave-and-pay smartphone technology would be top priority for PayPal, one of the biggest competitors in the mobile payments space. But while big retailers love NFC for its hyper-targeted marketing potential , small businesses that run on payment services like PayPal may actually be interested in mobile payments for something far humbler: customer loyalty

Yep, the next generation of mechanical heroes comes in all shapes and sizes. Robots of mostly academic interest may suddenly be getting a real-world baptism by fire, reports the Chronicle for Higher Education.

I was at lunch at Japango with some of my Foundry Group gang yesterday. When I went to my house in Alaska last July, I took a Mac with me but left my PC at home. Ross bet me $100 that before the month was out I'd beg him to fedex my PC to me.

Reid Hoffman, angel investor , co-founder of LinkedIn and Fast Company Most Creative Person , took the stage at SXSW interactive as part of the distinguished speaker series, and immediately brought the ballroom back to the future. “What are we stumbling toward here?” recalling the visions of a shiny future of yester-technology

Cyberdine has just shown the next iteration of its HAL robots--strap-on exoskeletons that boost the user's strength with electric motors.

In January, Mozilla announced plans to add a "Do Not Track" feature to Firefox, a tool that would allow users to opt out from having advertisers and other sites track their web-surfing habits. As Mozilla has readily admitted , the feature is far from perfect: Backwardly, tracking companies would actually have to agree not to monitor a user's browsing patterns, even once he or she opts out

Each day, Inc.'s reporters scour the Web for the most important and interesting news to entrepreneurs. Here's what we found today

A new "innovation center" opens in Mexico City. It's good business for local startups--and for IBM

CBS News correspondent Terry McCarthy reports on how fears of radiation exposure have caused sales of potassium iodide to spike on the U.S. West Coast.

Chris Wragge talks to nuclear energy expert Cham Dallas and Dr. Jennifer Ashton about radiation fears spreading to the U.S

Simpler, always-on wireless connections will make gadgets cheaper and make the Web ala carte. Despondent geeks and over-taxed laptops litter venues all over Austin, Texas, where Wifi connections at SXSW have been crippled by the crowds