E-mail secondary as Facebook revamps messaging

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Palo Alto, Calif., Thursday, April 7, 2011. Seeking to transform the energy efficiency of global data centers, Facebook today launched the Open Compute Project, an initiative to share the custom-engineered technology in its first dedicated data center in Prineville, Oregon.  (AP Photo/Marcio Jose Sanchez)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Palo Alto, Calif., Thursday, April 7, 2011. Seeking to transform the energy efficiency of global data centers, Facebook today launched the Open Compute Project, an initiative to share the custom-engineered technology in its first dedicated data center in Prineville, Oregon. (AP Photo/Marcio Jose Sanchez)

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