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Brian Morrissey, “Value of a ‘Fan’ on Social Media: $3.60,” Adweek.com, 13/4/2010.
http://www.adweek.com/aw/content_display/news/digital/e3iaf69ea67183512325a8feefb9f969530.
1 thg 4, 2024
17 thg 3, 2024