Here's a scenario to give trainers pause. You're presenting at a conference. Minutes into your session, a number of people are tapping furiously on their phones or reading incoming messages. Most of these people get up and leave the room, while another bunch trickles in. At least a third of the audience continues tapping out short bursts of text throughout your presentation. It's as if you aren't there.
Though it may not be apparent to someone unfamiliar with Web 2.0 behavior, t
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