Looks like the Great Firewall or something like it is preventing you from completely loading www.skritter.com because it is hosted on Google App Engine, which is periodically blocked. Try instead our mirror:
This might also be caused by an internet filter, such as SafeEyes. If you have such a filter installed, try adding appspot.com to the list of allowed domains.
This endpoint gives you the raw, overall data of a User's progress, the same which is used in the /progress page and put into a graph. Use this endpoint if you would like to: