Many services allow you to register and use their services by logging-in with your Facebook, Twitter, or Google credentials. If you use that option a lot, you might forgot just how many services have access to your Facebook, Twitter, and Google accounts. MyPermissions is a handy tool that will show you all of the services that you have authorized to access your social media accounts. The service can be used in your web browser or you can download the free MyPermissions iOS and Android apps.
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MyPermissions can be found here http://mypermissions.org/