How will this affect engagement?
Higher Click Through Rate! In theory, more information will allow you to tailor your ads to better appeal to the right customers, giving you a higher click through rate.
Better engagement! Those visitors who read your longer ads should have a better idea of what you offer. That means more of them should stay longer, leading to great awareness, leads, and sale. Keep in mind, however, there will always be a percentage of web visitors who click without reading carefully. They’ll click away quickly ... so you aren’t ever likely to see a zero bounce rate.
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