As for social media, it has been a powerful marketing tool for me because I intend to connect with as many people as possible. People know people, and if you develop a caring connection with someone you leverage your presence like no other practice. The key is to make things personal, not business. Reverse the famous Godfather quote and you’re good to go.

For effective and actionable results, you should do A/B tests, which test two (or more) different approaches. For example, you could send half of your list one subject line, and an alternate subject line to the other half. You could also A/B test the two approaches with a small subset of your list, then send the winning headline to the rest of the list.
Advertising your email list on websites other than your own site can be a great way to grow your email list. In fact, it can often be more profitable than simply advertising your website. If you can give users a compelling reason to sign up for your email (such as free offers or discount codes), it is a much lower barrier to entry for most people to sign up for an email list than to make an initial purchase. Just be sure that you understand how much you can afford to spend per email address and that you have a plan in place to identify which emails came from which advertising sources.
Unsubscribe rates track when you’ve finally lost permission for good. When someone unsubscribes from your list, it means they’ve gotten to the point where they’d like to formally revoke permission and never hear from you again. Marketers tend to focus on unsubscribe rates as the ultimate measure of when permission is lost. But the truth is, you probably lost permission far before your subscriber reached for that unsubscribe button.
By being on my newsletter or autoresponder, it’s an investment of time on the part of my subscribers. It’s my job to provide valuable content to give them an ROI on that time invested. When I’m confident I’ve done that, it makes sense to say “You’ve put in time and gotten value from what I’ve given you. If you now put in time and money I’ll give you even more value.”
Choosing an AppSumo product their target audience would like, they let people enter to win it by taking specific actions such as subscribing via email and sharing on Twitter. Because of the viral nature of social sharing, these giveaways amplify the initial promotion to quickly reach a larger audience, all while increasing the visibility of specific AppSumo products.
You can use this strategy to your advantage and increase your email list by giving people an incentive in return for their email. The giveaway could be free access to an e-book, a report, a gift hamper, or perhaps a lucky draw where people enter their emails and get a chance to win. A tantalizing offer is all you need for people to comply. For example: 
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