500 (for me) new people
This circle is realized with the following set of rules: I loaded the ripples of my public #Funny posts this week in . Then I set the filters so that only I have no relation with were left, I also removed the "blue heads" (people without profile picture). This resulted in a circle with 1341 people in it.
When you try to share a circle with more than 500 people in it, you receive the following message: "Some people have not been included in your shared circle. Only 500 people can be shared at one time." So from 1341 to 500 people in one second. I don't know whether these people are selected randomly or based on a certain rank.
Let me know what you think of the circle quality and have fun with it!!!