Social Media's Role in Civil Marketing
Harvard Business Review
FEBRUARY 22, 2011
eMarketer recently predicted Twitter's 2011 ad revenue will reach $150 million, a 200-percent increase over last year. Meanwhile, eWeek pegs Facebook's 2011 ad revenue at $4 billion , with users spending an average of 20 minutes per day on the site. Neither Twitter nor Facebook is at a loss for ad revenue or attention.
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