The basic gist behind Instagram spam bots is that they crawl around Instagram and "like" photos based on a particular hashtag, location, or username. The end goal is that the person whose photo was liked will follow back the person who liked the photo.
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The most popular tool among the blackhat crowd is FollowLiker.
It's in high demand for a couple of reasons: you can auto-follow users
as well as auto-like images and it offers support for Tumblr, Pinterest,
and Twitter in addition to Instagram.
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Robolike.
For under $10 per month, this tool will crawl around Instagram during a
time period you specify and like photos based on hashtags. It also
offers a 3-day free trial if you'd like to see how it works before
forking over any cash.
Finally, there's Tagliker, which is another popular spam bot.--
A few years back, Twitter filed lawsuits against 5 companies that made spam tools specific to the social site.
http://www.inc.com/john-lincoln/uncovering-the-dirty-world-of-instagram-spam-bots-how-they-work.html
http://www.followliker.com/
https://robolike.com/how-robolike-instagram-auto-liker-works/
