I'm looking for a way to automagically add people to certain circles in my g+.

If anyone here has an example of any piece of this, that would be great. Here's the full flow:

1. A person clicks a button / does an action on my website that gives me their google+ profile (they could even copy/paste their g+ profile link).

2. A piece of code then runs that adds that person automatically to a circle of mine.

This way I can automatically follow people by which of my sites they are interacting with.

Any help would be greatly appreciated!

Thanks!