One-third of marketers say they do not know which digital marketing tactic has the biggest positive impact on revenue, according to a recent report from Webmarketing123.

The report was based on data from a survey of 600 marketing professionals (a combination of B2B and B2C) based in the United States.

Some 26% of respondents say email is the digital marketing channel with the greatest positive impact on revenue; SEO is second (17%), followed by paid search (15%), social media (5%), and online display advertising (5%).

Below, additional key findings from the report.

B2B vs. B2C

Email is the most effective tactic for B2B marketers, with 31% saying it has the biggest impact on revenue.

Paid search is the most effective digital tactic for B2C marketers, with 24% saying it has the biggest impact on revenue.

Social Channels

Some 46% of B2B marketers are not sure whether any social channels have generated revenue for their business.

Most B2C marketers (56%) say Facebook has generated some revenue for their business.

About the research: The report was based on data from a survey of 600 marketing professionals (B2B and B2C) based in the United States.