Part of the changes to both has to do with joining StumbleUpon using Facebook and Google accounts. This was apparently not covered in the previous version. The company also now provides more explanation of the data it collects.
Here's the email in its entirety:
We know you (usually) enjoy reviewing legal forms as much as you enjoy doing your laundry, but please take some time to read through these changes (perhaps while you're doing your laundry). To make things easier, here are some updates we have made:
- In our mission to help you discover great content from across the Web, we clarify in our Terms of Service that while StumbleUpon refers and recommends its content, most of this content is controlled by third parties.