These circles represent the relationships you have with your friends (or acquaintances) on Twitter mainly, in short, the people with whom you interact the most.

Hi, Chirpty is the inspiration, but the system of this app was developed by myself, taking inspiration from another application that does much the same thing. I'm at your disposal if you have any questions, advice or even comments about the application. Thanks, Max.

Circulum.io uses publicly available twitter data to determine who you interact with the most. That's why there's no need to log in or provide your password. It fetches a number of your most recent tweets and likes. Then, it counts the number of interactions you've had with each person and assigns them a score. People are sorted into circles by their total scores, with higher scores closer to the inner circle (1 point for like/retweet, 2 points for quoted tweet, 3 points for mention). It's important to note that Circulum.io uses your interactions to calculate the circles. That means it uses people you mention, like, and retweet. People who mention you or like your tweets aren't counted because Circulum.io doesn't have access to that information. Circulum.io also can't see private (locked) accounts, so they won't appear in your circles. The list of people you've blocked also isn't public, so Circulum.io will still show them in your circles since it doesn't know they're blocked. You can hide any account from your circles by clicking or tapping on them. Hidden accounts are saved in your browser so you don't need to hide them again next time. Once your data has loaded, you are free to adjust the layout by changing the number of circles, as well as how many people appear in each circle.

Awesome! Will definitely try this out. Congrats on launch!