Search engines are the top way consumers discover retail promotions and deals, followed by e-mail, which 40.6% of people said they use as a shopping tool, according to a survey from Millward Brown Digital. E-mail still has a significant lead over third-place social media sites, according to the survey. "Although social media involves a lot more interactions, those are mostly with friends. E-mail provides a more intimate and private environment," said Uyen Chand, senior retail and CPG analyst for Millward Brown.

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