If you are an Instastalker or getting stalked on Instagram, you are in the right place. Here you can get all the details about the Instastalker app. You can check if you are being stalked on Instagram through this source. Instastalker is a term used for people on Instagram who stalk others' accounts without their knowledge. Many websites are available that will help them to do it easily. One such app is called the Instastalker.