NinjaGram is an Instagram bot with a variety of features. It lets you mass follow targeted users, from any location such as search results, your feed, another user’s followers, or pictures taken at a particular location. It can also be used to mass unfollow users with various settings, such as only those who don’t follow you back or only users followed more than X days ago. Mass "liking", automated commenting, tag-monitoring, image resizing, etc. are other features.