From the Official Poptropica Blog:
Whoa! We hoped that everyone would like Poptropica Friends, but even we didn’t expect it to be this popular. The demand for all the new Friends features has been so great that it’s overloaded our servers! As a result, we’ve temporarily had to turn off some of the features to address the load.
Be assured, we’re working hard behind the scenes to bring everything back up to speed. We’ll post any updates right here.
Thank you for your enthusiasm!