You may be asking why StumbleUpon sharing badge is not displaying on your website even though you added it as one of your enabled services.
The official StumbleUpon Button only works with HTTP websites as StumbleUpon loads a bunch of HTTP resources. So if your website is running with HTTPS, this will result in mixed-content warnings and will not work correctly.
As StumbleUpon has no plans to update this, Jetpack then decided to remove StumbleUpon on their next official release.
So when you update your Jetpack Plugin in the next few days, you won’t be able to see the beautiful StumbleUpon Sharing Badge in the Configuration page 🙁 anymore.