Thanks, and Good Luck
Eight Years ago, I developed Wordcircle to help students and teachers collaborate online. Since that time, I have had a career change, a life change, two children, and new priorities. The confluence of these factors makes it hard to find the time to maintain and upgrade software pet-projects like Wordcircle.
A few weeks ago, the website had a database corruption error, which forced me to make a decision about Wordcircle's future. To salvage the website would take me days. I decided to walk away.
There are many learning tools out there which offer better features than Wordcircle ever did. You can look into that list here.
Thanks for your support over the years. Good luck.