Considered a form of interruption marketing, interstitials are any page or pop-up that forms a roadblock to users’ path to content, either by displaying over the content or interrupting it. Users have no choice but to interact with the display before they can proceed. Forbes was a classic example of the “before” interstitial (also known as a “prestitial”).
You might be doing all the right things to generate leads -- landing pages, gated content, contests, and more. The problem might be that the design or copy itself isn't driving the engagement you need. A/B test (also known as "split test") different aspects of your list-building campaigns with different versions of the same content. This includes the call-to-action text, the color of the gated offer, the time of day you're posting to social media, and even where on your website these signup forms are placed. Sometimes a small change can drive hundreds more conversions.

Customer reviews are the "social proof" that encourages people to join in on something. It's one thing for you to tell people to sign up for a campaign, but it's another thing for your happiest customers to say it too. Publish your best reviews from communities like Yelp right to your website. This adds genuine value to your landing pages when people are on the fence about submitting their contact information. 


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.
Some services have referral programs for growing lists, but you won’t always get the right audience’s attention. So often, those programs for getting 100 subscribers in a day are abused and cheated, and you’ll end up with 100 robots who don’t actually read your emails. There is the chance that your service’s referral program is legit and will get you genuinely interested subscribers, but just make sure to do your research.
It used to be that marketers were set on building the largest email list possible, and many companies continue to boast about their “thousands” of subscribers. In order to stay competitive, marketers have tried tons of tactics to grow their lists, from pop-ups, to coaxing emails from lead gen assets, to running contests on social media that require an email address to sign up.

In this scenario, a subscription check box is pre-selected for users to receive promotional emails where they would be including their email address (during a purchase process, for example). By leaving the checked box intact, users consent to receive email from you. This option is not flawless, as some users may not realize they’ve given their permission to receive marketing email and could be much more likely to report your email as spam, resulting in damage to your sending reputation and your company.
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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