Hi there,
Thank you for reaching out. As you may be aware, we’re asking Snapchatters to change their password if we’ve detected them to be using third-party applications. We’ve also asked them to stop using those unauthorized applications.
If you’re wondering what a third-party application is, the answer is that it’s any app that isn’t the official Snapchat app downloaded from the Apple App Store or Google Play (keep in mind that Snapchat is not available for Windows or Blackberry devices, so if you’re accessing Snapchat with one of those devices, you’re definitely using an unauthorized third-party app). All third-party applications provide unauthorized access to our services by asking users to enter their Snapchat login information (username and password). And if you’re wondering why we’re taking this action, the answer is that using third-party applications to access Snapchat can compromise accounts and also violates our Terms of Use.
Direct links to the official iOS and Android Snapchat applications can be found at www.snapchat.com/download.
If you believe you received the notification in error, it may be because you are using an old version of Snapchat. Please make sure you have the most recent version of the app downloaded.
For more information please visit our blog: http://blog.snapchat.com/post/102413274285/update-on-third-party-apps
Best,
Team Snapchat