So I emailed homethinking.com support with a simple question: "How do you get your sales data?" I received this response:

Many thanks for your email Pike.
 
Basically, we try to notice a Realtor is representing a property by monitoring public data, and then we check the county records to see if the house ended up selling. But that method can be prone to errors in some parts of the nation where the county record data may not be updated in a timely manner.
 
Also, you can change anything on your profile via a free a tool that lets you manage your listings activity and change those that are selling to sold.
 
Claim your profile here (it's free):
http://www.homethinking.com/realtorcheckprofile.action?realtorId=931934&claimType=basic&routing=profile
 
And then you'll be taken to an area where you can change your activity.
 
If there is anything I can do to help, just let me know and my apologies once again.
 
Best.
Niki
 
Niki Scevak - Founder
Homethinking LLC
_________________________________________
phone: (646) 257-4099 | fax: (646) 224-6950
post: PO Box 4668 #9550, New York NY 10163

I find it interesting that Niki apologizes (again?), though I don't make a complaint. Do they receive complaints often enough that they assume any email from an agent is a complaint? Is she aware I am an agent? I did not send my question through my business email. Perhaps she found me on active rain...

Hold on...wait a minute....just a second....

Yes Niki Scevak is on Active Rain. Or was; it doesn't seem she has used the site since 2007. I don't think this is how she may have discovered I am an agent. A simple google search for "Pike Porter" would have put the question to rest. I did find that several agents ask buyers and sellers to read reivews of them on homethinking.com. Some agents find it useful. I also found this Active Rain blog post from September 7th, 2006:

http://activerain.com/blogsview/7316/what-the-heck-were-they-homethinking-com-with-this-turkey-