To get to the analytics, click on the three lines in the top left corner of the post and then select “View Insights.” Once you’re in the insights, scroll down and you’ll see “Sender.” This will tell you who sent the post to you. Conversely, you can know who sent or shared your post by looking through your notification. Instagram usually sends notifications to you when someone shares your post. RELATED: How To Know If Someone Follows You On Instagram