Source Percent who found it most helpful to go deeper
Search engine 50%
Facebook 7%
Online aggregator 5%
Wikipedia 5%
Local TV 4%
Online-only publisher 4%
National TV 3%
Specialized media 3%
Word-of-mouth 3%
Twitter 2%
Other social media 2%
Local newspaper 2%
National newspaper 2%
Blog 2%
Radio 1%