This Day in Tech: LinkedIn hosts a town hall event for Obama; Boeing's new 787 dreamliner

Too busy to keep up with the tech news? Here are some of the more interesting stories from CNET News for Monday, September 26.

• Obama visited Silicon Valley to try to woo technology leaders to discuss the economy and ways to move the country forward.

• So logging out of Facebook isn't enough? Facebook engineer says Facebook does track logged-out users. Just to put this rumor to rest, Facebook is still free. And, good thing Facebook fixed the unfriending bug so users can no longer see who unfriends them in the new Timeline.

• T-Mobile unveils high-end smartphones, including Samsung Electronics' Galaxy S II and HTC's Amaze 4G. Both phones will be available on October 12.

• Is Apple's App Store hogging cellular data? Apparently, searching and downloading apps from Apple's iOS App Store can take up to 13 percent of all data and audio. The app store comes in third place, following Web browsing. "Most people are blissfully unaware the App Store is hoovering up their data plan," Guy Rosen, co-founder and CEO of Onavo, said in a statement. "iPhone users should be much more careful when downloading their Angry Birds--it's something best done at home, within the safety of Wi-Fi."

• Boeing delivers 787 Dreamliner. "This is truly the first all-new airplane of the 21st century," said Jim Albaugh, president and CEO of Boeing Commercial Airplanes. "Thanks for your faith in us, your faith in Boeing....We could not have had a better launch [customer] than ANA."

• Fitness app Fleetly aims to make workouts a game.

• Zynga's CityVille arrives on Google+. It is hot on Facebook, so why not expand its social network reach?

• Future Apple gadgets may have curved glass.

• Facebook's iPad app is launching with the new iPhone.

• Some take message in a bottle, literally. Man builds a social network using Atlantic Ocean. The Canadian's social network includes 3,000 friends using bottled messages and tides. "I got one (note) back with five different people finding it," Hackett was quoted as saying by The Guardian of Charlottetown, capital of the island province.