Air Force warns troops about social networking

What we're following:

- 4 in 10 say marriage is becoming obsolete

- Suspected mail bomb found at airport in Germany

- GM relaunches as public company

And did you see...

- U.S. Air Force warns troops about using location based social networking services

- Qantas says half of the world's A380 engines may need fixing

- Bristol Palin and Mike "The Situation" Sorrentino team up for safe sex PSA

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