If that’s not enough to convince you to toss interstitials in the bin and never look back, there’s also the fact that users report these interactions as among their most-hated advertising practices (defined as ‘modals’ in this study by the Nielsen Norman Group). On a one to seven scale, modals (interstitials) landed at 5.82 for desktop users and 5.89 for mobile users, beating even autoplaying videos without skip for most-dreaded advertising type.

The most obvious and logical place to find interested email subscribers is on your website itself. If users are visiting your website (regardless of whether they purchase or make a transaction), they have an interest in the information or content that you're providing. Every page of your website should include an email sign-up box that allows users to join your mailing list. We'll discuss the best practices for creating that email sign-up box later in this section. However, every visitor to your website is a potential email subscriber.
Some ad platforms will ask more of your landing pages than others, when running ads. For example, AdWords is much stricter, when compared to Facebook. AdWords typically requires that you do not have a ‘thin,’ site that is designed solely to collect leads.  Because of this it might be a good idea to focus on using Facebook or Twitter, to begin with.
You might be a little bit worried that popup email sign-ups are going to hurt the user experience of your site. But, many bloggers have found that it isn’t bad at all. For example, Dan Zarella, found bounce rates only increased by a very small amount, while email sign-ups were 1.56% higher – which, in the long term, can be a lot of new subscribers.

Just because your email list is an online marketing tool, it doesn't mean that you only have to solicit emails online! If you have a retail location, you can collect emails when customers purchase or visit the store or other location. If you market by attending festivals or concerts, you can collect emails at those locations. Offering to raffle off a prize but requiring an email on the raffle ticket can also be an effective way to grow your email list. Of course, you'll have to dedicate the time to retyping all of the emails that you collect into your system, but it's often worth it. Don't overlook offline opportunities to grow your email list.
If that’s not enough to convince you to toss interstitials in the bin and never look back, there’s also the fact that users report these interactions as among their most-hated advertising practices (defined as ‘modals’ in this study by the Nielsen Norman Group). On a one to seven scale, modals (interstitials) landed at 5.82 for desktop users and 5.89 for mobile users, beating even autoplaying videos without skip for most-dreaded advertising type.

Your best bet will be to give away something that’s valuable to your target market; for instance, a high-value digital asset on a niche topic. You can give away products (we’ve all seen contests where the prize is a free iPad or gift certificates), however this strategy often leads to entrants who are more interested in the money than in what you have to offer.

Include social sharing buttons and an "Email to a Friend" button in your marketing emails. That way, you'll gain access to their friends, colleagues, and networks and expand your contact list. At the bottom of your emails, include a "Subscribe" CTA as a simple text-based link so that the people receiving the forwarded emails can easily opt-in, too.

Shoot a quick webcam video… Literally, just turn on your webcam and start talking in to the camera about your niche. Give some tips or ideas that will help people and save the recording. Put the video on YouTube and link over to the YouTube page after someone opts-in. It’s that simple. Don’t worry about the fact that people can find it by searching YouTube. They don’t know that before entering their email address. It doesn’t matter.
I always pause and laugh when I see a CTA with a small, “No thanks, I don’t want to lose weight,” button underneath a prominent “Yes, sign me up!” link. It reminds me there’s a person behind the button, and, while it’s meant to be a joke, it also incentivizes me to hesitate before clicking “no, thanks”. It’s easy to click “no” when the CTA is “sign up for more emails!”, but it’s a little harder to say no to losing weight or getting richer.
The live video option on Facebook, for example, can be increasingly used to your advantage, where you can connect with so many people at the same time. While you are at it, you can create a live contest too, through your live video, and get your audience on your email list by asking them to participate by leaving their email in the comment section.
The effort you put into building your email list is one of the best investments you can make online. Having access to the inboxes of targeted prospects means you can continue to build and nurture relationships over time, and become a trusted source of valuable industry knowledge. Then, when it’s time for your prospects to buy, you’ll be the first one who comes to mind.
I always pause and laugh when I see a CTA with a small, “No thanks, I don’t want to lose weight,” button underneath a prominent “Yes, sign me up!” link. It reminds me there’s a person behind the button, and, while it’s meant to be a joke, it also incentivizes me to hesitate before clicking “no, thanks”. It’s easy to click “no” when the CTA is “sign up for more emails!”, but it’s a little harder to say no to losing weight or getting richer.
If you take the time to build your email list the right way, you’ll encounter fewer obstacles with your deliverability and you’ll cultivate a strong group of brand advocates who will champion your email program. So when your boss tells you to send an “email blast” to as many people as possible, remind them that the numbers you want to concentrate on are your email engagement numbers, not your list size.
Once you have high-quality lists and are able to personalize campaigns, you should begin to think about email automation. Automation allows you to set up particular emails based on timing and triggers that send automatically based on subscriber behavior. For example, you might set up an automated welcome email after a subscriber signs up for your list.
I’ve tested the Welcome Mat and Smart Bar apps as well but they didn’t produce anywhere near the conversion rate of the List Builder and Scrollbox apps (note: that doesn’t mean you shouldn’t test them on your site… it’s just that they didn’t perform that well on our site with the setup we used so we removed them so not to distract the visitor too much while we figure out new ways to test them).

Once you’ve got that ability to shoot traffic to wherever you want, the skies the limit. You can promote affiliate products, you can always make sure your newest blog posts gets the attention it deserves, you can sell your own products to people, you can do favors for people by spreading the word of their cause or website… The list goes on and on. Having traffic at your fingertips is an awesome asset.
A suggestion? Include a newsletter opt-in check box directly on your retargeting message or if you are capturing sales leads, be sure to remind your sales team to ask the prospect if they wish to sign up to the company newsletter before adding them to your organisation’s marketing list. Last but not least, always remember to have your data privacy link readily available on your main website.

Pop-up forms provide visitors with a quick, convenient way to share contact information and subscribe to your list while they’re browsing your site, making them a powerful tool for audience growth. They’re easy to add to your site, and they’re proven to work—our research shows that Mailchimp users have seen their list growth rate increase by an average of 50.8% after adding a pop-up form to their site.

Some ad platforms will ask more of your landing pages than others, when running ads. For example, AdWords is much stricter, when compared to Facebook. AdWords typically requires that you do not have a ‘thin,’ site that is designed solely to collect leads.  Because of this it might be a good idea to focus on using Facebook or Twitter, to begin with.
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