Michael Zipursky (Unbounce)
Don’t let social media’s shine blind you to the enduring strength of email. To get more subscribers to opt in to this effective channel, consider using one of those pop-up overlays—that’s right, those sometimes-annoying boxes that forces you to either comply with the request or “X” out. One study found that the average overlay can boost opt-ins by up to 400%. Also consider the pros and cons of double opt-in.