See Andy's other stuff:
Promise, clearly and without hesitation, to never, ever sell or give away the visitor’s email address.
That single sentence is the different between someone choosing to click the subscribe button or walk away.
Take a look at this great example from Neuromarketing.
Learn to get people talking about your company, cause, or idea.
Learn more >>
We're the community for social media leaders at the world's greatest brands. Learn more >>
You can have amazing word of mouth, and I can help you do it.
My New York Times bestselling book, Word of Mouth Marketing: How Smart Companies Get People Talking, is full of practical, how-to tips on how you can get more people talking about you tomorrow. Book site | Amazon
My keynote speeches about word of mouth marketing and social media, will leave your group energized, educated, entertained, and enthusiastic about the power of word of mouth.
My companies:WordofMouth.org: 
Learn to be great at word of mouth marketing.
SocialMedia.org: We're the community for social media leaders at the world's greatest brands.
Contact me:Click here, I'd love to meet you.
People need to know that their privacy is valued by companies. Just look at the latest Instagram kerfuffle.
Interestingly, they have that sentence on the popover’s subscribe form, and not on the subscribe form on the actual page.
I don’t recall where it was, but I do recall someone split-testing this and finding that the privacy line lessened response.
Now, that may be all right, in that the ones dissuaded may not have been good list-members anyway, OR perhaps the privacy question was raised by the disclaimer and was not yet a concern to the subscriber.
If a bag of candy said on the package, “This bag contains no spiders” it may SOUND like a helpful comment, or it could remind you to watch what you’re eating.
Sean
p.s. First time here, nice blog stuff. Thanks!
Sean – I love the spider comment!