Kevin Spacey, who has 800,000 followers on Twitter, tried to get David Letterman into micro-blogging Tuesday night on The Late Show. "Does that cost you money?" Dave asked. When Kevin responded no, the actor whipped out his Blackberry to send a tweet out to his followers from Dave. "You know what it reminds me of?" Dave said, "Oh yeah, a waste of time." (Photo: WENN)

Watch the antics here:

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