Simple concepts guys.
1) Never give true information in your yahoo profile.
2) Never use a mail client to access your yahoo mail. Login from your web browser instead.
3) Never use yahoo toolbar plugins, or yahoo IM plugins.
As you can see, at this point it has no point, just a dated, insecure, and completely unnecessary service.
Amazon is the king here, because their model for web commerce is better, shipping logistics, ground resources, transaction security, server capacity, warranties, multi-nationals, etc.
Verizon just wants to own a similar piece of that web commerce market to brand and put on their android devices, just like Amazon does. It's going to be a long time before they operate at a profit, because they simply don't have the ground infrastructure in place to compete with Amazon.
TC