The fast-moving, viral nature of Twitter has its perils, but it can also be used for good.

CNN: Heather Kelly,

The fast moving, viral nature of Twitter has its perils, but it can also be used for good.

CNN: Heather Kelly,

Such assistance has its perils.

CNN: STORY HIGHLIGHTS

From its inception, the Strategic Defense Initiative has undergone the perils of Pauline.

CENTERFORSECURITYPOLICY: Hapless SDI damsel in distress: Awaiting a hero