Examples Opt-in Response Rate Wikipedia 
Hubspot
NOVEMBER 6, 2018
For example, every Nike advertisement you see or hear on the way to work probably isn’t part of a campaign. For example, if Nike were campaigning about the release of a new product, their advertising would be one piece of their broader marketing efforts, which might also encompass email, social media, and paid search. Why is that?
Hubspot
DECEMBER 21, 2010
According to Wikipedia , " Email marketing is a form of direct marketing which uses electronic mail as a means of communicating commercial or fund-raising messages to an audience. Marketing Takeaway: If you have a "join our mailing list" form on your website, you should place it "above the fold" making it easy for visitors to opt-in.
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