According to Sacca, a high percentage of photos shared on Instagram lead to user engagement, most often in the form of "likes." That promise of feedback brings users back to the site, repeatedly.
"That engagement creates the dopamine effect that leaves users feeling fantastic and coming back for more," Sacca told Bloomberg. Photo sharing without engagement won't lead to the dopamine effect―though it might lead to a narcoleptic one.
Give your users a way to share, tweet, like, or "+1" your content. You can't optimize for engagement if you don't facilitate it.
If you want customers to engage your brand, you need to produce a significant volume of high-quality content. Creating that content is a business-critical function; staff and budget for it accordingly.
The journey to a million user engagements begins with one "like." Early evangelists are among your most important customers. Target them with custom messaging and special offers―and keep them engaged.
When customers start engaging your content, build on that momentum. Don't cut it off with premature "asks." The easiest way to kill engagement is by selling.