Signup activity from 2000-2013
 

I stopped the bot around 2013 because the amount of profile urls was only at about 65% and I thought "good enough."

You can see where instances of abuse took place. Some of the registered profiles (many) have the last login date the same as the registration date on the profile (in the spikes).

http://i.imgur.com/xOBSa4d.png