2012 Examples Opt-in Response Rate 
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 16, 2014
Phase 0 (2006-2007): Building Our Opt-In Email List. I say "unleashed" because it really did take off -- over the course of its first year, it garnered thousands of opt-in email addresses. The early success of HubSpot''s lead generation playbook can be attributed to this single asset and opt-in strategy.
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