Alex Trebek the Hero, Celebs Unite to Help A Family, and a Presidential Prank on Twitter

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The answer: "the bravest game show host." The question: "Who is Alex Trebek?" That's because the 71-year-old "Jeopardy" host tore his Achilles tendon while chasing a burglar down the hall of a San Francisco hotel. Trebek was in the Golden Gate city with his wife to host the National Geographic World Championship. At the event he answered the question, "Why are you on crutches?" by saying, "The answer is: At 2:30 yesterday morning, chasing a burglar down the hall...my Achilles tendon ruptured and I fell in an ignominious heap to the carpeting, bruising my other leg in the process." The suspect, 56-year-old Lucinda Moyers, was later apprehended by police; she is accused of taking money and valuables. Alex Trebek is trending on Twitter, where people are commending his bravery, marveling at how good he looks at 71, and joking that he made the suspect answer for the crime in the form of a question.

A tragic accident is demonstrating the compassion of social media, and the positive power of celebrity. A car crash over the July 4 weekend left Houston children Peter (age 9), Aaron (age 8), and Willa Berry (age 6) orphaned when both their parents were killed. The family was driving back home from Colorado when their minivan was hit head-on by a vehicle that had crossed into their lane. The boys suffered spinal chord injuries leaving them paralyzed from the waist down, and their sister, Willa, has a broken arm and ankle. The children need help to pay for medical bills, physical therapy, psychological support, and their education, and Justin Bieber is answering their call. The king of social media (with more 33 million Facebook fans and 11 million Twitter followers) is spearheading a campaign to raise money for the Berry children called Show Your Hearts. Supporters who donate $10 to the fund get a special profile picture that shows hands in the shape of a heart. Lady Gaga , Ellen Degeneres, Britney Spears, Sean "P. Diddy" Combs, Ryan Seacrest, and Khloe Kardashian are just some of the celebrities supporting the cause on social media with the image. In just one day, hashtag #showyourhearts has garnered tens of thousands of tweets. The Berry children, who now have their own Twitter account, have tweeted, "What an incredible day - words will never be able to express our gratitude." To donate, you can visit showyourhearts.org.

The White House Twitter feed pulled one of the oldest Internet pranks in the book yesterday. As the deadline to raise the debt ceiling looms, the White House is holding daily Twitter Q&A sessions to help people better understand the deficit negotiations. When Twitter user David Wiggs tweeted that "this White House correspondence briefing isn't nearly as entertaining as yesterday's," not only did the White House tweet back, but it "Rickrolled" him. "Rickrolling" is a popular Web prank that tricks someone him into clicking a link they think is relevant to the topic at hand, but is actually a link to Rick Astley's 1987 hit "Never Gonna Give You Up." The White House tweeted, "@wiggsd Sorry to hear that. Fiscal policy is important, but can be dry sometimes. Here's something more fun: tinyurl.com/y8ufsnp #WHChat." Wiggs took the joke in stride, replying back to the White House, "love it!"

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