GoogleTechTalks: Kristina Lerman is an Assistant research professor at the Computer Science Department at USC and a Project Leader at the USC Information Sciences Institute.
Twitter's retention rate lower than Facebook's/Myspace
"Twitter has enjoyed a nice ride over the last few months, but it will not be able to sustain its meteoric rise without establishing a higher level of user loyalty. Frankly, if Oprah can’t accomplish that, I’m not sure who can."
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