Twitter dominated talks big and small at last year's BlogWorld -- and the conversation landed in the Guinness Book of World Records. Attendees at the Las Vegas social-media mecca were challenged to tweet the hashtag #beatcancer, and it spread, setting a record for the most tweets (700,000!) in a 24-hour period, and raising $70,000 for cancer research, thanks to corporate partners eBay/PayPal and MillerCoors Brewing Co. Read More »