How are photos and videos chosen for Search & Explore?
Search & Explore shows you photos, videos and people that you might like. We’re always working to update the types of posts and people you see in Search & Explore to better tailor it to you. For example, we may show you photos and videos liked by people whose posts you’ve liked and/or posts that are liked by a large number of people in the Instagram community.
A notification will appear in Activity if your post appears on Search & Explore because it’s trending in the Instagram community. You'll also get a push notification if you have notifications turned on for Instagram.