Check out all the on-demand sessions from the Intelligent Security Summit here.

Last night, @KevinSpacey explained Twitter to a surprisingly clueless Dave Letterman, who truthfully responded that if he wanted a few thousand followers to say hi, all he had to do was walk outside to 53rd and Broadway.

The clip is good because Spacey and Letterman proxy the public’s opposing reactions to Twitter. Spacey loves the easy connection with fans around the world. Letterman gropes for words: “You know what it reminds me of? I’m thinking it reminds me a little of … oh yeah, a waste of time!”


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