Source Percent who used it first to go deeper
Search engine 57%
Facebook 7%
Online aggregator 4%
Wikipedia 4%
Local TV 4%
Online-only publisher 3%
National TV 3%
Specialized media 3%
Word-of-mouth 3%
Other social media 3%
Local newspaper 3%
National newspaper 2%
Twitter 1%
Blog 1%
Radio 1%