Technology_Internet

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Taunting messages about the "Frontline" program appeared on the PBS website Monday. PBS also said its Twitter account had been hacked. (Associated Press)

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An image made from NASA Television shows the space shuttle Endeavour as it does its fly-around of the International Space Station on Monday, May 30, 2011, before returning home from NASA's penultimate shuttle mission. The shuttle is viewed from the space station as it passes over Australia. (AP Photo/National Aeronautics and Space Administration)

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associated press Andrew Levan one of the researchers who say they have found the most distant explosion ever detected, a pulse of gamma radiation sent by a disintegrating star more than 13 billion light years away.

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Lantz Hare, 16, has been missing since a deadly tornado hit Joplin, Mo., on Sunday, May 22, 2011. (AP Photo/Mike Hare)

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This undated image courtesy of Jamiedurie.com shows an outdoor space designed by HGTV's Jamie Durie, host of "The Outdoor Room with Jamie Durie," using solar lighting. Whether on a small terrace or in a sweeping landscape, lighting creates a welcoming and often dramatic atmosphere. (AP Photo/Jamiedurie.com )

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This product image courtesy of Plow and Hearth shows Light Bulb Solar Lights. Whether on a small terrace or in a sweeping landscape, lighting creates a welcoming and often dramatic atmosphere. (AP Photo/Plow and Hearth, Andy Franck)

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This product image courtesy of My Solar Shop shows solar stepping stones lighting a pathway. Whether on a small terrace or in a sweeping landscape, lighting creates a welcoming and often dramatic atmosphere. (AP Photo/My Solar Shop)

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This undated image courtesy of Jamiedurie.com shows an outdoor space designed by HGTV's Jamie Durie, host of "The Outdoor Room with Jamie Durie," using solar lighting. Whether on a small terrace or in a sweeping landscape, lighting creates a welcoming and often dramatic atmosphere. (AP Photo/Jamiedurie.com )

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It's been 75 years since a new generation of clear acrylics known as Lucite were born, changing interior design forever. The Lucite pieces in this room were designed by Coffinier Ku Design and fabricated by PlexiCraft. (Associated Press)

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A photo taken by NASA's Mars Exploration Rover Spirit in 2008 shows the Martian landscape. NASA is ending efforts to revive the immobilized robot. (NASA via Associated Press)

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Sen. Susan Collins, Maine Republican, and Sen. Joe Lieberman, Connecticut independent, members of the Homeland Security Committee, were part of the debate Monday on presidential powers in the even of a cyber-attack on vital systems. (Associated Press)

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ASSOCIATED PRESS Boom Studios´ "Stan Lee Boom! Comics App" makes the current crop of creations from the man behind the likes of the Fantastic Four and the X-Men available online and on mobile devices. The titles will also be available for download on desktops.

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ASSOCIATED PRESS Carl Edwards celebrated after winning the Sprint All-Star Race at Charlotte Motor Speedway on Saturday night. All four Roush Fenway Racing drivers finished in the top eight.

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Barnes & Noble's Nook electronic reader now accounts for 28 percent of the market for those devices. It has the potential to go beyond books to deliver all types of digital products, including music, magazines, TV shows and movies. Cable television mogul John Malone is offering $1 billion to buy the bookstore chain. (Associated Press)

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Freedom Riders Jim Zwerg (left) and Rep. John Lewis pray at the opening ceremony of the Freedom Riders Museum in downtown Montgomery, Ala., on Friday, 50 years after they endured attacks by a mob of segregationists. (Associated Press)

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Jeff Weiner (second from right), LinkedIn's CEO, celebrates the company's listing on May 19, 2011, at the New York Stock Exchange. LinkedIn, based in Mountain View, Calif., is an internet-based social networking rolodex for business people. (Associated Press)